Celebrating 19 Years on the Web
TODAY IN SCIENCE HISTORY ®
Find science on or your birthday

Today in Science History - Quickie Quiz
Who said: “I have no satisfaction in formulas unless I feel their arithmetical magnitude.”
more quiz questions >>
Home > Category Index for Science Quotations > Category Index P > Category: Protozoa

Protozoa Quotes (5 quotes)

But however secure and well-regulated civilized life may become, bacteria, Protozoa, viruses, infected fleas, lice, ticks, mosquitoes, and bedbugs will always lurk in the shadows ready to pounce when neglect, poverty, famine, or war lets down the defenses.
Rats, Lice and History (1934), 13-4.
Science quotes on:  |  Bacteria (48)  |  Become (815)  |  Bedbug (2)  |  Civilization (204)  |  Defense (23)  |  Down (456)  |  Famine (15)  |  Flea (11)  |  Infection (27)  |  Life (1795)  |  Lurk (5)  |  Mosquito (14)  |  Neglect (63)  |  Pounce (4)  |  Poverty (37)  |  Secure (22)  |  Shadow (72)  |  Tick (9)  |  Virus (27)  |  War (225)  |  Will (2355)

Examining this water...I found floating therein divers earthy particles, and some green streaks, spirally wound serpent-wise...and I judge that some of these little creatures were above a thousand times smaller than the smallest ones I have ever yet seen, upon the rind of cheese, in wheaten flour, mould, and the like.
[The first recorded observation of protozoa.]
Letter to the Royal Society, London (7 Sep 1674). In John Carey, Eyewitness to Science (1997), 28.
Science quotes on:  |  Cheese (9)  |  Creature (233)  |  First (1283)  |  Flour (4)  |  Green (63)  |  Judge (108)  |  Little (707)  |  Microorganism (28)  |  Mold (33)  |  Observation (555)  |  Particle (194)  |  Record (154)  |  Science (3879)  |  Thousand (331)  |  Time (1877)  |  Water (481)  |  Wise (131)  |  Wound (26)

I must … explain how I was led to concern myself with the pathogenic protozoa. … I was sent to Algeria and put in charge of a department of the hospital at Bone. A large number of my patients had malarial fevers and I was naturally led to study these fevers of which I had only seen rare and benign forms in France.
From Nobel Lecture (11 Dec 1907), 'Protozoa as Causes of Diseases', collected in Nobel Lectures, Physiology or Medicine 1901-1921 (1967, 1999), 264.
Science quotes on:  |  Benign (2)  |  Bone (95)  |  Charge (59)  |  Concern (228)  |  Department (92)  |  Explain (322)  |  Fever (29)  |  Form (959)  |  France (27)  |  Hospital (43)  |  Large (394)  |  Malaria (10)  |  Must (1526)  |  Myself (212)  |  Naturally (11)  |  Number (699)  |  Pathogen (5)  |  Patient (199)  |  Rare (89)  |  Study (653)

In attempting to understand the elements out of which mental phenomena are compounded, it is of the greatest importance to remember that from the protozoa to man there is nowhere a very wide gap either in structure or in behaviour. From this fact it is a highly probable inference that there is also nowhere a very wide mental gap.
Lecture II, 'Instinct and Habit', The Analysis of Mind
Science quotes on:  |  Behaviour (41)  |  Compound (113)  |  Element (310)  |  Fact (1210)  |  Gap (33)  |  Greatest (328)  |  Importance (286)  |  Inference (45)  |  Man (2251)  |  Mental (177)  |  Mind (1338)  |  Remember (179)  |  Structure (344)  |  Understand (606)  |  Wide (96)

This leads us to ask for the reasons which call for this new theory of transmutation. The beginning of things must needs lie in obscurity, beyond the bounds of proof, though within those of conjecture or of analogical inference. Why not hold fast to the customary view, that all species were directly, instead of indirectly, created after their respective kinds, as we now behold them,--and that in a manner which, passing our comprehension, we intuitively refer to the supernatural? Why this continual striving after “the unattained and dim,”—these anxious endeavors, especially of late years, by naturalists and philosophers of various schools and different tendencies, to penetrate what one of them calls “the mystery of mysteries,” the origin of species? To this, in general, sufficient answer may be found in the activity of the human intellect, “the delirious yet divine desire to know,” stimulated as it has been by its own success in unveiling the laws and processes of inorganic Nature,—in the fact that the principal triumphs of our age in physical science have consisted in tracing connections where none were known before, in reducing heterogeneous phenomena to a common cause or origin, in a manner quite analogous to that of the reduction of supposed independently originated species to a common ultimate origin,—thus, and in various other ways, largely and legitimately extending the domain of secondary causes. Surely the scientific mind of an age which contemplates the solar system as evolved from a common, revolving, fluid mass,— which, through experimental research, has come to regard light, heat, electricity, magnetism, chemical affinity, and mechanical power as varieties or derivative and convertible forms of one force, instead of independent species,—which has brought the so-called elementary kinds of matter, such as the metals, into kindred groups, and raised the question, whether the members of each group may not be mere varieties of one species,—and which speculates steadily in the direction of the ultimate unity of matter, of a sort of prototype or simple element which may be to the ordinary species of matter what the protozoa or component cells of an organism are to the higher sorts of animals and plants,—the mind of such an age cannot be expected to let the old belief about species pass unquestioned.
Asa Gray
'Darwin on the Origin of Species', The Atlantic Monthly (Jul 1860), 112-3. Also in 'Natural Selection Not Inconsistent With Natural Theology', Darwiniana: Essays and Reviews Pertaining to Darwinism (1876), 94-95.
Science quotes on:  |  Activity (210)  |  Affinity (27)  |  Age (499)  |  All (4108)  |  Animal (617)  |  Answer (366)  |  Ask (411)  |  Beginning (305)  |  Belief (578)  |  Beyond (308)  |  Bound (119)  |  Call (769)  |  Cause (541)  |  Chemical (292)  |  Common (436)  |  Component (48)  |  Comprehension (66)  |  Conjecture (49)  |  Connection (162)  |  Consist (223)  |  Continual (43)  |  Customary (18)  |  Desire (204)  |  Different (577)  |  Direction (175)  |  Divine (112)  |  Domain (69)  |  Electricity (159)  |  Element (310)  |  Elementary (96)  |  Endeavor (67)  |  Evolution (590)  |  Expect (200)  |  Experimental (192)  |  Fact (1210)  |  Fluid (51)  |  Force (487)  |  Form (959)  |  General (511)  |  Heat (174)  |  Human (1468)  |  Human Intellect (31)  |  Independently (24)  |  Inference (45)  |  Intellect (233)  |  Kind (557)  |  Kindred (12)  |  Know (1518)  |  Known (454)  |  Late (118)  |  Law (894)  |  Lead (384)  |  Lie (364)  |  Light (607)  |  Magnetism (41)  |  Mass (157)  |  Matter (798)  |  Mechanical (140)  |  Metal (84)  |  Mind (1338)  |  Must (1526)  |  Mystery (177)  |  Naturalist (70)  |  Nature (1926)  |  New (1216)  |  Old (481)  |  Ordinary (160)  |  Organism (220)  |  Origin (239)  |  Other (2236)  |  Pass (238)  |  Passing (76)  |  Penetrate (67)  |  Philosopher (258)  |  Physical (508)  |  Physical Science (101)  |  Plant (294)  |  Power (746)  |  Principal (63)  |  Proof (287)  |  Prototype (9)  |  Question (621)  |  Reason (744)  |  Reduction (51)  |  Regard (305)  |  Research (664)  |  School (219)  |  Science (3879)  |  Scientific (941)  |  Scientific Mind (13)  |  Simple (406)  |  So-Called (71)  |  Solar System (77)  |  Species (401)  |  Success (302)  |  Sufficient (128)  |  Supernatural (25)  |  Surely (101)  |  System (537)  |  Theory (970)  |  Thing (1915)  |  Through (849)  |  Transmutation (22)  |  Triumph (73)  |  Ultimate (144)  |  Unity (78)  |  Unquestioned (7)  |  Various (200)  |  View (488)  |  Way (1217)  |  Why (491)  |  Year (933)


Carl Sagan Thumbnail In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion. (1987) -- Carl Sagan
Quotations by: • Albert Einstein • Isaac Newton • Lord Kelvin • Charles Darwin • Srinivasa Ramanujan • Carl Sagan • Florence Nightingale • Thomas Edison • Aristotle • Marie Curie • Benjamin Franklin • Winston Churchill • Galileo Galilei • Sigmund Freud • Robert Bunsen • Louis Pasteur • Theodore Roosevelt • Abraham Lincoln • Ronald Reagan • Leonardo DaVinci • Michio Kaku • Karl Popper • Johann Goethe • Robert Oppenheimer • Charles Kettering  ... (more people)

Quotations about: • Atomic  Bomb • Biology • Chemistry • Deforestation • Engineering • Anatomy • Astronomy • Bacteria • Biochemistry • Botany • Conservation • Dinosaur • Environment • Fractal • Genetics • Geology • History of Science • Invention • Jupiter • Knowledge • Love • Mathematics • Measurement • Medicine • Natural Resource • Organic Chemistry • Physics • Physician • Quantum Theory • Research • Science and Art • Teacher • Technology • Universe • Volcano • Virus • Wind Power • Women Scientists • X-Rays • Youth • Zoology  ... (more topics)
Sitewide search within all Today In Science History pages:
Visit our Science and Scientist Quotations index for more Science Quotes from archaeologists, biologists, chemists, geologists, inventors and inventions, mathematicians, physicists, pioneers in medicine, science events and technology.

Names index: | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |

Categories index: | 1 | 2 | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |

- 100 -
Sophie Germain
Gertrude Elion
Ernest Rutherford
James Chadwick
Marcel Proust
William Harvey
Johann Goethe
John Keynes
Carl Gauss
Paul Feyerabend
- 90 -
Antoine Lavoisier
Lise Meitner
Charles Babbage
Ibn Khaldun
Euclid
Ralph Emerson
Robert Bunsen
Frederick Banting
Andre Ampere
Winston Churchill
- 80 -
John Locke
Bronislaw Malinowski
Bible
Thomas Huxley
Alessandro Volta
Erwin Schrodinger
Wilhelm Roentgen
Louis Pasteur
Bertrand Russell
Jean Lamarck
- 70 -
Samuel Morse
John Wheeler
Nicolaus Copernicus
Robert Fulton
Pierre Laplace
Humphry Davy
Thomas Edison
Lord Kelvin
Theodore Roosevelt
Carolus Linnaeus
- 60 -
Francis Galton
Linus Pauling
Immanuel Kant
Martin Fischer
Robert Boyle
Karl Popper
Paul Dirac
Avicenna
James Watson
William Shakespeare
- 50 -
Stephen Hawking
Niels Bohr
Nikola Tesla
Rachel Carson
Max Planck
Henry Adams
Richard Dawkins
Werner Heisenberg
Alfred Wegener
John Dalton
- 40 -
Pierre Fermat
Edward Wilson
Johannes Kepler
Gustave Eiffel
Giordano Bruno
JJ Thomson
Thomas Kuhn
Leonardo DaVinci
Archimedes
David Hume
- 30 -
Andreas Vesalius
Rudolf Virchow
Richard Feynman
James Hutton
Alexander Fleming
Emile Durkheim
Benjamin Franklin
Robert Oppenheimer
Robert Hooke
Charles Kettering
- 20 -
Carl Sagan
James Maxwell
Marie Curie
Rene Descartes
Francis Crick
Hippocrates
Michael Faraday
Srinivasa Ramanujan
Francis Bacon
Galileo Galilei
- 10 -
Aristotle
John Watson
Rosalind Franklin
Michio Kaku
Isaac Asimov
Charles Darwin
Sigmund Freud
Albert Einstein
Florence Nightingale
Isaac Newton



who invites your feedback
Thank you for sharing.
Today in Science History
Sign up for Newsletter
with quiz, quotes and more.