Louis Pasteur

11 Pages 2874 Words

larized light. I prepared from it, in his presence, the sodium ammonium double salt, for which he also desired himself to provide the soda and ammonia. The solution was set aside for slow evaporation in one of the rooms of his own laboratory, and when thirty to forty grams of crystals had separated, he again summoned me to the College of France so that I might collect the dextro and levorotatory crystals before his eyes, and separate them according to their crystallographic character-asking me to repeat the statement that the crystals which I should place on his right hand would cause deviation to the right, and the others to the left. This done, he said!
that he himself would do the rest. He prepared the carefully weighed solutions, and at the moment when he was about to examine them in the polarimeter, he again called me into the laboratory. He first put into the apparatus the more interesting solution, the one which was to cause rotation to the left. At the first sight of the color t...