MEDEARIS AND MARBLE: THYMUS GLAND. 



145 



TABLE No. 7— CONCLTJDED. 



Total result, 10+, 8 — 



Note No. 1. — It will have been noticed that in the foregoing report nothing 

 has been said concerning the percentage of thymi by length. An examination 

 of the tables will show that there is indeed an increase in this percentage as 

 larger and larger pigs are examined, but that this increase is neither marked 

 nor uniform, and we must consider that part of the increase in weight must 

 come by this increase in length. We feel that the method by which we secured 

 the thymus lengths was not accurate and uniform enough to allow much value 

 to be attached to the figures recorded. They may be taken as rather approxi- 

 mate. In general, the length of the thymus will average about 25 per cent of 

 the total length of the pig. Suffice it to say, however, that we believe that as 

 the foeti grow older and older there is an increase in the percentage of thymus 

 by length; just how regular and consistent this increase is, we cannot say. 



Note No. 2. — It is interesting to note that the pigs used for dissection 

 showed a preponderance of males. This was probably purely accidental, how- 

 ever, and if larger numbers of animals had been used a more balanced ratio 

 would have been secured. 



10— Science Bui.— 3728 



