Description of Plates 
Fig. i.— A small (5 mm.) oval hemal node supplied with two parallel veins 
whose contour suggests lymphatics. These veins gave off two branches, as indi- 
cated, and joined to form a single trunk of the usual appearance. 
Fig. 2. — A node similar to that represented in fig. 1, with adjacent smaller 
nodes with veins of similar character. 
Fig. 3. — A group of small discrete hemal nodes simulating a long, tortuous sin- 
gle node. 
Fig. 4. — Appearance of the group of nodes shown in fig. 3 as seen in longi- 
tudinal section. Right half. 
Fig. 5. — Hemal node injected with India ink from the vein by puncture from 
an adjacent node. This node contained many exceedingly large phagocytes shown 
as red dots all over the section, even in the follicles. All the ink lies in the venous 
radicles in the parenchyma. 
Fig. 6. — Section of another node injected similarly to the one in fig. 5. Some 
pigment is free in the parenchyma and in the follicles, but very little is found in 
the hemal areas. 
Fig. 7. — Hemal node adjacent to the thymus from a lamb 4-5 months old. In- 
jected with carmine gelatine from the abdominal aorta. The injection is only a 
partial one, because the aorta was ligated proximally to the point of injection. 
Fig. 8. — Camera lucida drawing of a small hemal node from a goat. The trib- 
utary veins are shown in section at the bottom and to the right, where they commu- 
nicate directly with the peripheral venous lacunae but not with the subcapsular blood 
space. The lacunae — true venous sinuses — which are continuous, are bounded by 
an endothelial wall, and successive sections illustrate the relation of the veins to 
them and to the subcapsular blood space very clearly. 
Fig. 9. — An injected lymph node from a lamb, showing the wholly different char- 
acter of the injection as compared with those in figs. 5 and 6. 
Fig. 10. — A hemal node from a goat, showing a vein and an artery which pass 
entirely through the node. Although the vein comes in contact with the hemal 
areas, it opens only into the parenchyma. Note the absence of a hilus, relation of 
the venous lacunae — clear spaces — to the hemal areas, and the relation of the latter 
to each other. Camera lucida. 
Fig. it. — Another section of the same node showing the artery in longitudinal 
section and the direct continuation of the subcapsular blood area into a peri-arterial 
one. Camera lucida. 
Fig. 12. — Two veins tributary to the subcapsular blood space of a hemal node 
from the sheep. Camera lucida. 
Fig. 13. — A portion of a node injected with India ink from an adjacent node. 
The pigment lies in the lymphatic tissue, and has not invaded the large blood space 
which it surrounds, x 290. 
Fig. 14. — A cross-section of a node largely depleted of lymphatic tissue, and 
containing very many follicles and numerous large veins. 
Note — Please view figures 6, 9 and 18 with a reading glass. 
