THE SIMPLER ORGANISMS 33 



A food solution for yeast that bears the name of the great 

 biologist, whose fame rests in part on discoveries he made 

 of the part yeasts play in fermentation, is the following: 



Pasteur's Solution. 



WaterH a O 83.76 % 



Cane Sugar C ia H aa O IX 15.00 ' 



Ammonium tartrate (NH 4 ) 2 C 4 H 4 O 6 i.oo ' 



Potassium phosphate K 3 PO 4 0.20 " 



Calcium phosphate Ca 3 (PO 4 ) 2 0.02 



Magnesium sulphate MgSO 4 0.02 " 



LOUIS PASTEUR 



(1822-1895) 



"One of the most conspicuous figures of the nineteenth 



century." Pioneer student of fermentation, of disease 



germs, etc. His services to his country and to 



humanity are commemorated by Pasteur 



Institutes for the treatment of infectious 



diseases throughout the civilized 



