Question: State what are the conditions favourable for the formation of dew. Describe an instrument for determining the dew point, and the method of using it.
Answer: This is easily proved from question 1. A body of gas as it ascends expands, cools, and deposits moisture; so if you walk up a hill the body of gas inside you expands, gives its heat to you, and deposits its moisture in the form of dew or common sweat. Hence these are the favourable conditions; and moreover it explains why you get warm by ascending a hill, in opposition to the well-known law of the Conservation of Energy.

Beware of old Linnaeus,
The Man of the Linden-tree,
So beautiful, bright and early
He brushed away the dews
He found the wicked wild-flowers
All courting there in twos.

Even the facts of science may dust the mind by their dryness, unless they are … rendered fertile by the dews of fresh and living truth. Knowledge does not come to us by details, but in flashes of light from heaven.

Every dew-drop and rain-drop had a whole heaven within it.

For keenest enjoyment, I visit when the dew is on them, or in cloudy weather, or when the rain is falling: and I must be alone or with someone who cares for them as I do.

The particles of a dew-drop and the masses of a planet are moulded and controlled by the same force.

We have now felled forest enough everywhere, in many districts far too much. Let us restore this one element of material life to its normal proportions, and devise means for maintaining the permanence of its relations to the fields, the meadows and the pastures, to the rain and the dews of heaven, to the springs and rivulets with which it waters down the earth.

We stand by the river and admire the great body of water flowing so sweetly on; could you trace it back to its source, you might find a mere rivulet, but meandering on, joined by other streams and by secret springs, and fed by the rains and dews of heaven, it gathers volume and force, makes its way through the gorges of the mountains, plows, widens and deepens its channel through the provinces, and attains its present majesty.

What makes the beauty of this flower which blows?
 Not nourishing earth, nor air, nor heaven’s blue,
 Nor sun, nor soil, nor the translucent dew;
But that which held in combination grows
Whole in each part, and perfect at the close.
 Chemist nor botanist no more than you
Can see that pure necessity wherethrough
Beauty is born—a rose within the rose.

Where the untrained eye will see nothing but mire and dirt, Science will often reveal exquisite possibilities. The mud we tread under our feet in the street is a grimy mixture of clay and sand, soot and water. Separate the sand, however, as Ruskinn observes—let the atoms arrange themselves in peace according to their nature—and you have the opal. Separate the clay, and it becomes a white earth, fit for the finest porcelain; or if it still further purifies itself, you have a sapphire. Take the soot, and it properly treated it will give you a diamond. While lastly, the water, purified and distilled, will become a dew-drop, or crystallize into a lovely star. Or, again, you may see as you will in any shallow pool either the mud lying at the bottom, or the image of the heavens above.