366 



Dcvelo])nK'nt of the Lvinphalic Nodes in the Pig 



side, however, bands of connective tissue project into the sac without 

 destroying its endothelial lining at any point. The connective tissue in 

 these bands and on tlie right border of the sac appears different from 

 the surrounding tissue. 



Studied with the oil immersion lens, the surrounding connective tissue 

 appears as described by J\[all " to be a network of granular protoplasm in 



Fig. 8. Primary lymph node from a transverse section of the neclv of an 

 embryo pig, 3.6 cm. long, x about 60. The left side of the figure is the mesial 

 side of the heart, the right side is toward the skin and shows the afferent 

 ducts. The top of the figure is the position of the hilum of the node. Ld, 

 lymph duct (afferent) ; lU. lymph heart; v, vein. 



which are distinct anastomosing fibrils. The nuclei lie in the nodes of 

 the network and each one has around it a drop of clearer protoplasm 

 which he calls endoplasm, distinct from the rest or exoplasm. Xear the 

 lymph sac, on the right hand side in the figure, are numerous blood capil- 

 laries and around each one are clumps of from 8 to 20 nuclei. These 



"Mall: American .Journal of Anatomy, Vol. I, 1902. 



