208 



GROWTH OF PARTS AND ORGANS 



by Jackson ('13). His results have been corroborated by studies 

 on the stock Albinos from the colony of the Wistar Institute, 

 Hatai ('13). The values for the graph in chart 31 and those 

 given in table 144 are based on formula (15). The graph for the 

 male only is entered, but the values for the female are like those 

 for the male of the same body weight. Under unfavorable 

 nutritional conditions the weight of the eyeballs follows the age 

 rather than the body weight. Hatai (MS '14). 



TABLE 140 

 Giving for ten ages the total brain weights and their ratios, the weights of the parts 

 and the ratios of the weights of parts to their respective initial loeights at birth, 

 in the albino rat brain 



* The olfactory bulbs are very variable in weight, 

 the above sometimes occur. 



Undeveloped bulbs like 



5. Organs with a nearly uniform growth after the first very early 

 phase of rapid growth — heart, kidneys, liver, spleen, lungs, (blood), 

 alimentary tract, stomach, pancreas, submaxillaries, thyroid, hypo- 

 physis and suprarenals. 



In case of all of the organs to be described the preparation was 

 carried on beneath a glass hood to prevent drying. The organ 

 was weighed in a small glass stoppered bottle and the weight was 

 taken to a tenth of a milligram. 



The weight of the heart on body weight. Technic : The heart was 

 removed after cutting all its vessels close to their proximal ends. 



