262 
for the reddening of these lumbar nodes and lymphatic vessels there 
is no question that these nodes were lymphatic and not hemal nodes. 
Injections into red mediastinal nodes gave similar results. 
In another animal only fourteen months old, all the abdominal 
and thoracic nodes and especially those near the common iliac vessels 
were reddened. The iliac nodes which measured 13>x7 mm. were 
somewhat flattened. Careful injections from the periphery gave like 
results as in the preceding dog. In addition to these reddened lymph 
nodes quite a number of very small— !/,—2 mm.—reddish nodules 
were found in the great omentum but these were supernumerary 
spleens if a distinction between the latter and hemal nodes can be 
made. The inguinal and axillary nodes were of the usual color. 
In a third dog in which all the supernumerary spleens were 
present in the great omentum three very red nodules were found in the 
gastro-splenic omentum. Injection of these showed that they were 
lymph nodes and not accessory spleens and emphasizes the necessity 
for caution in deciding what are and what are not accessory spleens 
as stated by HABERER (12) as a result of an investigation on the oc- 
currence of such organs in man. 
In a fourth dog a node measuring 12><10><4 mm. with a pale 
gray center sorrounded by a deep red border internal to the peri- 
pheral sinus which was distended with chyle, was found in the mesentery. 
One side of this node was bordered by a large lymph vessel which 
gave several branches to it, but in this instance also the afferent 
vessels were easily injected with India ink from the duodenum. 
Similar results were invariably obtained in the case of similarly 
reddened nodes found in any other location.) In other instances in 
which the cranial sternal and some of the mediastinal nodes were 
intensely red they were also found to be in connection with the 
lymphatic system. This was true also of some small red nodes about 
one and a half millimeters in diameter which were found in the 
mediastinum. Since these could not be injected by puncture they 
were excised and studied microscopically and although microscopical 
differentiation is not always possible if only a small number of sections 
are studied, careful examination of serial sections always revealed 
their undoubted resemblance to congested or hemorrhagic lymph nodes 
1) The popliteal and cervical nodes were not examined in most animals 
because they almost always were typical lymph nodes. 
