60 



Florence R. Sabin. 



out in fig. 16 from a pig 5.5 cm. long. The sac is shown in the depth 

 and the swollen anterior curvature (deep jugular gland) and apex 

 (gland of the posterior triangle) stand out through the relatively small 

 size of the connecting vessel. 





Fig. 16. — Injection of the jugular lymph sac, the superficial cervical 

 plexus, and the superficial lymphatic vessels in the neck of a foetal pig 

 5.5 cm. long. After A. H. Clark (24). The specimen was fixed in forma- 

 lin 10 per cent formol and made transparent by the Spalteholz method. 

 Magnified 7 times. The figure is to be compared with fig. 5 in the Amer. 

 Journ. of Anat., 1904, Vol. 3, p. 118, which shows a complete injection of the 

 superficial lymphatics of the same stage. A. s. = apex of the lymph sac 

 which forms the lymph gland of the posterior triangle of the neck; A. c. = 

 anterior curvature of the lymph sac, which forms the deep jugulo-pharyngeal 

 lymph gland; C. p. = superficial cervical lymphatic plexus; S. g. = lympho- 

 glandular submaxillaris; S. s. = stalk of the jugular lymph sac. 



From the apex of the sac superficial lymphatic vessels grow both 

 from the dorsal and from the ventral border. Those from the dorsal 

 and caudal border make a large plexus of superficial lymphatics which, 



Digitized by Microsoft® 



