OF CURRENT FORCE DURING SECRETION. 
283 
Experiment 3. Temperature of external cell 67 
Temperature of internal cell J30 
Vibrations ; and 
♦ O 
Temperature of external cell 81 
Temperature of internal cell 110 
In whatever manner the experiments were varied, Avhether by using Avater at greater 
or less differences of temperature, similar results Avere obtained. The vibrations 
were sharp and quick at the commencement, but soon terminated; in no instance 
could a decided effect upon the needle be obtained by making and breaking contact, 
and the effects were not in any way similar to those observed in the animal body. There 
is one remark, however, which might be made in reference to these experiments, viz. 
if we could keep the tAAm fluids at constant temperatures at the point of contact, more 
decided effects might be expected. 
Before we dismiss the subject of thermo-electric actions, we ought, perhaps, to re- 
late some experiments in which a resistance — a liquid conductor — was added to the 
circuit, and see if the current would be capable of traversing it. V^e shall relate 
these experiments further on, and for the following reasons, assuming for a moment 
that the current Avould be arrested, we should not then be justified in coming to the 
conclusion that they are therefore due to thermo-electric actions ; and our object is, 
as we ha\’e stated before, to ascertain if possible the existence, not the force of the 
current. 
§ 2 . On the manifestation of Current Force during Urinary Secretion. 
Experiment 1. — Rabbit. Prussic acid dropped on the eye. One electrode in con- 
tact AA’ith the mucous surface of the ureter, the other inserted into the renal vein of 
the left kidney ; no effect. One electrode inserted into the urinary bladder, the other 
into the renal vein of the right kidney ; the latter slightly positive. There was great 
difficulty in catching the vibrations of the needle. 
Experiment 2 . — Rabbit. Prussic acid dropped on the eye. One electrode inserted 
into the bladder, the other into the left renal vein; the latter positive 5°: the latter 
electrode Avas then placed on the surface of the intestines ; no effect. 
After a short time similar circuits were formed between the bladder and the right 
renal vein ; no effect. 
Experiment 3. — Cat, Prussic acid, swallowed. Between the bladder and left 
renal vein ; the latter positive 8°. 
Experiment 4. — Cat. Prussic acid, swallowed. Between the bladder and both 
renal veins ; the latter slightly positive. 
Bladder much distended : urine acid to litmus. 
Experiment 5 . — Cat. Prussic acid, swallowed. Between left renal vein and blad- 
