LYMPHATIC AND VASCULAR RELATIONS 
19 
which after being injected formed a network of the greatest delicacy, 
were so fine that they were barely visible to the unaided eye. 
In a large series of puncture injections, it was never possible to in- 
ject a lymphatic vessel or a lymph node from a hemolymph node unless 
the point of the needle pierced the hemolymph node, thus allowing the 
injected fluid to enter the retro-peritoneal tissues. A series of puncture 
injections made into the surrounding tissues and body wall proved equal- 
ly ineffectual for injecting the hemolymph nodes or blindly ending lym- 
phatics. Both lymphatic vessels and lymph nodes, on the contrary, were 
injected comparatively easily by either of these methods, and injections 
into lymph nodes always led to the well-known results. The usually 
characteristically beaded lymphatic channels were instantly apparent, 
other lymph nodes were injected, and the injected fluid soon ran out of 
the cut end of the thoracic duct in the cervical region, just as it had 
previously run out of the vena cava in the thoracic region. Nor did the 
injection of some unusually large — 3-4 mm. — lymphatic channels occa- 
sionally seen in the lumbar region, result in the injection of anything but 
lymph channels and lymph nodes. In three carcasses, for example, espe- 
cially large lymph channels three to four millimeters in diameter lay 
superficially among a group of hemolymph nodes in the lumbar region. 
The injection by puncture of methylene blue into these large lymph ves- 
sels, even when the thoracic duct had been clamped and lymph nodes on 
all sides were injected both peripherally and centrally, resulted negative- 
ly, as before, as far as injection of hemolymph nodes is concerned, even 
when high pressure was used. Hemolymph nodes, on the other hand, 
were never injected, even if they lay side by side with or directly upon 
or beneath injected lymph nodes; and not a trace of the injection was 
ever found in them upon microscopical examination. 
The facts just cited, together with others to be considered, prove 
conclusively, it seems to me, that, as maintained by Weidenreich [38], 
the circulation of true hemolymph nodes, exclusive of the capsule at 
least, has no connection whatever with the lymphatic system. They 
prove further that there probably are no nodes of a mixed type having 
sinuses common to the vascular and lymphatic systems, and that conse- 
quently the word hemolymph is a misnomer when applied to these nodes 
of the sheep. Since, then, all these so-called hemolymph nodes are solely 
in direct connection with the vascular system alone, and contain no 
lymph spaces, the designation of hemal node first used by Clarkson [2] 
is preferable, and will hence be used in this discussion. 
Since these results seemed to indicate that hemal nodes are entirely 
