330 



J. A. BADERTSCHER 



N.xn 



Text figs. A, B, C, D Outline drawings of the exposed left thymus of embryos 

 respectively 105, 140, 170 and 280 mm. (full term) in length; natural size. C.ct., 

 cervico-thoracic cord; C.i., intermediary cord; C.t., caput thymus = thymus 

 head; N.XII, hypoglossal nerve; S.m., mid-cervical segment; S.th., thoracic seg- 

 ment; T.S., thymus superficialis. 



Text fig. E Outline drawing of the exposed left thymus of a 'runty' pig, one 

 day old and only 240 mm. in length; natural size. The thymus in this speci- 

 men was a few millimeters shorter than that in the full-term embryo; this is 

 perhaps due to the fact that the specimen was a 'runt'. C.ct., cervico-thoracic 

 cord; C.i., intermediary cord; C.t., caput thymus = thymus head; N.XII, 

 hypoglossal nerve; S.m., mid-cervical segment; S.th., thoracic segment; T.s., 

 thymus superficialis. 



