MEDEARIS AND MARBLE: THYMUS GLAND. 127 



TABLE NO. L 



Table No. 1 shows the original data as taken in the laboratory 

 concerning each pig, together with individual averages, sex aver- 

 ages, and litter averages. From the table all the derivations and 

 calculations of the report will be taken. Its value lies largely in 

 reference, and will not be used much to point out conclusions. How- 

 ever, it is well to note from it the number of pigs dissected, namely, 

 147 from 18 different litters. 



Relation of Sex to Thyml's. 

 An examination of the averages listed beneath each litter in table 

 No. 1 will readily show, in regard to sex, that males and females 

 have practically the same percentage of thymus in the same stage 

 of development. Consider particularly the percentage thymus by 

 weight as balanced against the length of the pig, and this state- 

 ment becomes evident. It is true that in several of the litters the 

 females have the greater percentage of gland, but this tendency is 

 practically balanced by the fact that many of the litters show ap- 

 proximately equal averages for males and females, and others show 

 the balance in favor of the males. If our results be taken to show 

 any positive tendency at all, it is that the females have the larger 

 thj^mi (proportionally), but the writers believe that this is due to 

 the small number of pigs dissected, and that such a positive tendency 

 is too weak to merit much consideration. As such, special curves 

 and tables have not been made for this part of the report. Not- 

 withstanding, Hatai (4) in relevant material states that "so far 

 as our present data are concerned, the thymus gland of the female 

 of the albino rat appears to be slightly heavier than that of the 

 male; nevertheless, the difference found is too slight to justify 

 treating the sexes separately." 



