DR. MOXON, ON A MOTOR NERVE. 235 
The experiments I have recorded show that the blue 
particles in the blood answer to tests which indicate either 
Prussian blue or a cyanide of iron, and that no reasons exist 
for supposing them to be composed of indigo. 
25. If, a year ago, I had been asked if it were possible to 
detect the effects of prussic acid on the animal economy by 
the aid of the microscope, I should have unhesitatingly 
answered for myself, I could not, and if any one else could 
I should be only too glad to learn how, for it seemed to me 
to be out of the reach of the instrument to investigate and 
reveal its effects. But the direction and extent the present 
investigations have taken encourage me to expect that ere 
long many more important facts will be brought to the con- 
sideration and study of the medical man armed with the 
assistance of the microscope, even while endeavouring to 
fulfil his daily duties in medical practice, and that more and 
more additional inducements will be held out to him to work 
with it, with a fair promise of receiving the due reward for 
his labours. 
Description of the PertpHerat TERMINATION of a@ Moror 
Nerve. By W. Moxon, M.D., F.L.S. 
In the spring of the year 1862 it chanced to me, in the 
course of observations upon the anatomy of insect larve, to 
light upon an example of a muscle on which the ending of a 
nerve can with certainty and exactness be seen. 
So much light has since that time been thrown by Con- 
tinental observers upon the manner of termination of nerve 
upon muscle, that in my observation there is now not much 
that is new. But I am induced to publish it because the 
weight of authority in this country at the present time 
determines to the total denial of such manner of termination, 
and because the insect on which the observation was made is 
plentifully distributed, and any competent microscopist can 
easily find the particular muscle and assure himself of the 
mode of motor nerve ending. 
So long ago as 1836 Doyere first saw the ending of a motor 
nerve upon a muscle in Tardigrada. He described the nerve 
as ending in a conical expansion, the base of the cone resting 
on the side of the muscle, whilst its apex was continuous 
with the nerve, which approached the muscle at right angles. 
