40 ON THE PARTS OF THE NERVOUS SYSTEM 
of nearly 3°, and exhibited no variations, while, at the same time, other 
evidences of loss of vitality in the tissues began to show themselves. The 
accompanying outlines of the calibre of a limited portion of the artery, which 
was the subject of special observation, have been made from micrometrical 
measurements selected from among a large number daily registered. They 
will serve to convey an idea of the more striking varieties of appearance pre- 
sented at different times. It may be mentioned, that the diameter of the 
vessel, when most dilated, was about 44 times the length of a red corpuscle of 
the frog’s blood. 
Be Me 
PUDYIL 9 <2 ements 6 op.m. Oe ee 
Apri 95 nccses 3 15 p.m. ea eens eres 
SUPT 7 cesses O)7 7 pn, | 22 
i ag i 
April 7 ‘dccce II 20 p.m. 
April 10)... 5 Op.m. TPS ey NEC ae es Spe eel 
Jie) SL ae 
pet eee e ee 
It must be added, that the limb was kept wrapped in clean wet lint in 
a cool place in the intervals of the observations, and that during the periods 
of examination care was taken to guard against warmth or dryness, or any 
other agency calculated to injure the delicate tissues of the webs. 
Thus irregular contractions, precisely similar to those which accompanied 
local arrest of the circulation in the experiment of October 23, took place in 
consequence of amputation of the limb; and as there could be no doubt that 
in both cases they were produced in the same manner, there was no longer 
any reason to suspect that sympathetic ganglia in the trunk might have had 
any share in their development in the former instance. Yet the circumstance 
above mentioned, that in the amputated limb the tendency to constriction 
usually affected a considerable tract of the vessel, and sometimes its entire length, 
to nearly the same degree, or in other words, that the muscular fibre-cells of 
the circular coat of the artery still contracted in concert with each other, 
seemed to imply the operation of a co-ordinating nervous apparatus contained 
