(source) 
Joseph Loschmidt
(15 May 1821  8 Jul 1895)

Quotes by others about Joseph Loschmidt (1)
We must make the following remark: a proof, that after a certain time t_{1}, the spheres must necessarily be mixed uniformly, whatever may be the initial distribution of states, cannot be given. This is in fact a consequence of probability theory, for any nonuniform distribution of states, no matter how improbable it may be, is still not absolutely impossible. Indeed it is clear that any individual uniform distribution, which might arise after a certain time from some particular initial state, is just as improbable as an individual nonuniform distribution; just as in the game of Lotto, any individual set of five numbers is as improbable as the set 1, 2, 3, 4, 5. It is only because there are many more uniform distributions than nonuniform ones that the distribution of states will become uniform in the course of time. One therefore cannot prove that, whatever may be the positions and velocities of the spheres at the beginning, the distributions must become uniform after a long time; rather one can only prove that infinitely many more initial states will lead to a uniform one after a definite length of time than to a nonuniform one. Loschmidt's theorem tells us only about initial states which actually lead to a very nonuniform distribution of states after a certain time t_{1}; but it does not prove that there are not infinitely many more initial conditions that will lead to a uniform distribution after the same time. On the contrary, it follows from the theorem itself that, since there are infinitely many more uniform distributions, the number of states which lead to uniform distributions after a certain time t_{1}, is much greater than the number that leads to nonuniform ones, and the latter are the ones that must be chosen, according to Loschmidt, in order to obtain a nonuniform distribution at t_{1}.
See also:
 15 May  short biography, births, deaths and events on date of Loschmidt's birth.