MEDEARIS AND MARBLE: THYMUS GLAND. 



137 



TABLE No. 4— Concluded. 



Relation Between the Weight of Pigs and the Percent.age 

 BY Weight of the Thymus, Using Weight Group Averages 

 Throughout, Disregarding Litters. 



Table No. 5 and curve No. 4 show that as larger and larger foeti 

 (as regards weight) are examined and classified regardless of litter, 

 there is a steady increase in the percentage of thymus by weight. 

 As has already been noted in curve No. 3, the increase is not uni- 

 form. When we compare this curve No. 4 with curve No. 2' (where 

 the pigs are classified according to litters), it is evident that the 

 latter is smoother by far. Hence from these calculations on weights 

 in addition to the calculations already noted on lengths, we may 

 conclude that pigs tend to have the same size thymus as that of 

 other pigs in the same litter, regardless of individual sizes. 



