M TUITION \M» likuW I II 



.'. . 



growth vitamines? . to which were added more carbohydrate, purified 

 fat, and the protein whose influence <>n growth it was desired to Btudy. 

 The same diel was fed a1 regular intervals to a given batch of rats, and 

 the weighl of each ra1 was periodically taken, the observation l"-in<_ r pro 



longed until the animals grew to maturity and prodi 1 young, and these 



again <Mrw to maturity, reproduced, and so on. By plotting the re- 

 sults in curves, with the time periods along the abscissae and the averi 

 weight of the rats of each batch along the ordinates, the extenl of the 

 influence of a given diel on tin curvt of growth was obtained. A normal 

 curve of growth is shown in No. 1 of Pig. 183. It was obtained from re- 

 sults secured by adding liberal amounts of casein to 1 1 1 « - basal diet. 



■500 



IU 



vo 

 lie 

 too 



Mf 

 IfeO 



I- 



ito 



too 



te 



10 



IM,1 



lacri division -Jto dayi 



Days 



Cach divijion - ZOday* 



Pig, 184. — Cun growth of rau ina indicated. In curve 



III tk of the additii n to an inadi I protein, lactalbumin, 



1 in 1\' the effect of the addition from 

 I. at Mendel and T, B. Osb 



Similar curves were obtained with Lactalbumin of milk and ovalbumin 

 and ovovitellin of egg Perhaps the mosl interesting substances capable 

 of producing the normal curve of growth are certain of tin- proteins thai 

 T. B. Osborne has succeeded in separating in crystalline form from 



jetable foodstuffs. These are edestin hempseed . globulin squ 

 seed . excelsin (Brazil nut , glutelin maize . globulin (cottonseed , 

 glutein (wheal . glycinin soy bean), cannabin (hempseed 



Thai growth p Is normally with any one of these proteins when 

 fed abundantly does not, however, n sssarily indicate that each con- 

 tains in adequate proportion all of the n ry units to meel the pro- 

 tein demands of growing tissues. In the case of casein, I ample, 

 one of tin 1 units, namely, glycocoll, which is the simplesl of all the 



