136 
EXTRACTS FROM EXCHANGES. 
EXTRACTS FROM EXCHANGES. 
GERMAN REVIEW. 
By Adolph Eichhorn, D.V.S., Milwaukee, Wis. 
The Formation of RYMPHfG. Moussu ],—Older physiolo¬ 
gists explained the lymph production as a filtration under the 
influence of the blood pressure. This hypothesis was already 
opposed by Heidenhein, who considered the lymph as a secre¬ 
tion of the capillary endothelium. Moussu made a careful study 
of the influence of the blood pressure on the lymph circulation. 
He produced a lymph fistula in the region of the neck on a horse, 
so as to establish, first, the amount of the normal production, 
and then the increase or decrease, as the case may be. He ele¬ 
vated and reduced the blood pressure of the head, by severing 
or stimulating the cervical cord of the sympatheticus, and came 
to the following conclusions : (i) The blood pressure plays a 
part in the formation of lymph. (2) A local reduction of the 
blood pressure and a slight dilatation of the vessels, reduce the 
production of lymph, and the lymph current. (3) A local in¬ 
crease of the blood pressure, and contraction of the vessels, in¬ 
creases the quantity of lymph, and the lymph current. And 
finally, to prove the effect of the tissues on the formation of 
lymph, the author proved that while the horse was taking up 
food, and during the process of mastication, salivation and deg¬ 
lutition, the quantity of lymph was increased 5-10 and often 15 
times the amount as when at rest. This increase could not be 
traced back to the arterial pressure, as when this is raised in the 
carotid, it falls in the smaller arteries of the muscles (muscles of 
mastication). Therefore he proved that the total activity of the 
tissues produces a considerable amount of lymph. The ques¬ 
tion arises now, how much of this is to be credited to the ac¬ 
tivity of the muscles, and how much to the salivary glands ? 
Moussu decided on this question, by producing a salivary secre¬ 
tion, when the muscles are in a state of rest. For this purpose, 
he injected in a horse pilocarpin, and in a cow he stimulated the 
secretory nerve of the parotid. In spite of the considerable ac¬ 
tivity of the glands, the lymph current did not show any 
marked change; therefore, the activity of the muscles play the 
most important part in the formation of lymph.— (Soc. Biol.) 
The Treatment of Wounds of the Hock Joint [A. 
Hinfc \.—Traumatic wounds of the hock joint, with synovial 
