Carl Christoph Vogt, Popular Science Monthly (1878)
“ Leverrier and Regnault had originally been clerks in stores, and had studied in their leisure hours until they were able to gain admittance to the Polytechnic School; Claude Bernard had come to Paris with hardly anything in his pocket but a tragedy, and he had first dabbled in literature. Hard, indescribably hard work, untold privations, and struggles of all kinds, enabled these men to attain the high position which they will always hold in the history of science. ”
