Mr. Todd’s experiments on the Torpedo , &c. 33 
anterior extremities of the electrical organs. When the tor- 
pedos were placed in a bucket of water, the fishermen amused 
themselves by exposing the smaller fish to their electrical 
power. 
EXPERIMENTS. 
I intersected the large lateral cartilages of the smallest tor- 
pedo near their posterior connection with the trunk, and all 
the muscles inserted into them. The shocks continued to be 
received as before. 
I divided in the same torpedo that part extending from the 
anterior part of the large lateral cartilages to the process 
projecting from the anterior part of the head. No alteration 
was observed in the production of the shocks. 
The same experiments were repeated on the larger tor- 
pedo with the same results. 
I removed the superior surface of the right electrical organ 
of the largest torpedo. Shocks were received as before 
l made a vertical and longitudinal incision two and a half 
inches in length, in both the electrical organs of the largest 
torpedo. I received the shocks as before. 
The same experiments were repeated on the smallest one 
with the same results. 
The torpedos in the intervals of the experiments were 
allowed to remain in water, and at this period they were 
allowed to remain a quarter of an hour. When examined, 
they seemed considerably exhausted. The smallest one was 
still capable of producing weak shocks. The largest one 
was less exhausted. 
I continued the above-mentioned incisions in the largest one, 
so as to remove one half of each electrical organ. Shocks 
were still received, though weaker. 
F 
MDCCCXVII. 
