646 



THE LYMPHATICS. 



subdivision : in such a way that the trunk of the canal, at first single, becomes double, 

 then quadruple, and consequently opens into the venous system by four distinct orifices. 



Fig. 306 



Fig. 307. 



Fig. 308. 



VARIETIES OF THE THORACIC DUCT IN THE OX. 



If the branches of the canal, instead of remaining isolated, send off transverse anastomoses, 

 there results a complication of whioh Solipeds do not offer an example (Fig. 305). 



The thoracic duct is often double throughout its extent. The two canals are then 



