122 



LAWSON G. LOWREY 



In table 2 some data are given for comparison of growth in 

 the pig, human, rabbit, white rat and chick. The figures for the 

 rabbit are derived from Waldeyer ('06), Fehling (77) and Minot 

 ('07); those for the white rat from Donaldson ('06) and unpub- 

 lished observations by Jackson; those for the chick from Welcker 

 ('03) and Davenport ('08). 



TABLE 2 

 Table of comparative growth 



THREE WEEKS 



Absolute weight Absolute weight 



Number of times 

 increase 



Pig 



Human. . . 

 Rabbit... 

 White rat 



Chick.... 



0.000003 

 0.000004 

 0.000003 

 0. 000003 (?) 

 (total egg ) 

 (35-40 g.) 



9- 



0.25 

 0.016 

 11.7 

 5.0 



30.0 



83,000 



4,000 



3,900,000 



1,670,000 



(?) 



Conclusions on comparative growth 



From table 2 of the development of these various animals, it 

 will be seen that the general course of relative growth of the pig 

 agrees with that of all the others, in that the rate is very rapid in the 

 early embryonic stages, decreasing at first rapidly, then more 

 slowly, throughout prenatal and postnatal life, until the adult 

 size is reached. 



