124 



THE VITAMINES 



Reviewing the many publications dealing with the growth of rats, 

 it is evident that only strictly positive or strictly negative results are 

 recorded. On the other hand, we have often seen rats that were 

 not in the best of health after 90 to 100 days on a diet that could be 

 regarded as complete in every respect. To give a concrete example- 



I9Q 



170 



150 



130 



C5 



90 



70 



NOfl 



MAL 



*!DAYS : 



NUTf ITIOM 



face 



so 



TIG. 29. RETARDED GROWTH SOMETIMES NOTED IN RATS ON A SUPPOSEDLY 



ADEQUATE DIET, COMPARED WITH THE NORMAL 



CURVE (FUNK-DUBIN). 



we have only to record a diet used in the work of Funk and Dubin 

 (I.e. 331): 



Substance Percent Substance Percent 



Extracted meat ... 22 Lard 20 



Cane sugar 15 Starch 22 



Butter ....10 Agar 3 



Substance Percent 



Autolyzed yeast ... 4 



Orange juice 3 



Salts.. ..3 



Despite the fact that this composition is above reproach, in the 

 light of present-day knowledge of nutrition, our animals did not 

 grow very well. Thereupon, we tried to bring about normal growth 



