English translations of Science and Hypothesis as well as The Measure of Time can be read here;
`http://en.wikisource.org/wiki/Science_and_Hypothesis',
`http://en.wikisource.org/wiki/The_Measure_of_Time'.
In French, most of Poincare's original works can be read here;
`http://henripoincarepapers.univ-lorraine.fr/bibliohp/index.p....