H^EMOLYMPH GLANDS. SPLEEN. 87 



There are also mucous glands whose ducts open surepficially. (H) 

 Examine the epithelium over the nodules, and note that it thins 

 down frequently to a single cell over the lymph nodules, the cells 

 of which may easily pass through such places. 



Haemolymph glands, from the prevertebral fat of the sheep. 24 

 (p. 3, s. 22 & 24, c. P., m. B.) These structures closely resemble 

 small lymph glands, the notable difference being that the wide 

 sinuses, which are particularly evident in the medulla, are filled 

 with red blood-cells instead of lymph corpuscles. 



Spleen, for capsule and trabeculse, Sheep, (p. '8, s. 22 & 24, 

 c. P., m. B.) (L) The muscular capsule is thick, and sends 

 trabeculse into the interior of the organ. The pulp lies close to, 

 and is in contact with them everywhere. The larger trabeculse 

 are tunnelled by blood-vessels. The pulp is uniform in appear- 

 ance, excepting where it presents circular and more darkly stained 

 outlines in its substance, the splenic bodies. (H) Examine the 

 capsule and trabeculae for non-striped muscle. Follow the 

 trabeculse into the pulp, note the vessels in their interior and 

 then inspect the pulp. Little more can be made out beyond the 

 fact that it is crowded with cells. The outlines of the splenic 

 bodies present the appearance of faint concentric striations. 



Spleen. Kitten, (p. 3, inj., s. 22 & 24, c. P. very thin m. B.) 

 (H) Examine in the pulp for the commencement of veins. These 

 will be found with careful search, as small often branching spaces 

 with a continuous endothelial outline where the wall is complete, 

 and elsewhere an indefinite boundary, where the cavity of the 

 vessel merges into the spaces of the adenoid tissue. Many of 

 the cells are loaded with coarse granules stained with eosin, 

 which form mulberry-shaped masses. These are red blood-cells 

 in course of disintegration. 



