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nerves and ganglions in producing animal heat, 
kept in a small paddock with two companions. On the 
26th of July it had bruised the horn so much, on which 
the experiment had been made, that the diary could no 
longer be continued, and that horn was then the hottest of 
the two. 
Upon examination, after death no union had taken place 
between, the divided trunk, but it was evident from the reco- 
very of its heat, that some other connection had been formed 
between the nerves? of the horn and these of the head. 
This will not appear surprising when I mention that the 
fallow deer, beforethey have antlers, sheditheir horns in June; 
and immediately after, they again begin to bud, and in the 
middle of August are completely hardened. Those with 
antlers mew iir April or May, according to their keep, and 
at the end of August are at their full growth. So that in the 
space of four months all the nerves that are to supply the 
deer’s horns of a full head have not only begun to form, and 
arrived at’their, full growth, but have ceased to exist. This 
rapidity of growth accounts for their recovering in five days 
from any check that can- be given to their ready communi- 
cation with one another. 
Having gone thus far in my enquiry respecting animal 
heat, I. was determineduiot to proceed till I had satisfactorily 
made out whether the placenta is furnished with nerves ; 
and upon, that discovery being made by Mr. Bauer’s admi- 
rable. microscopical observations, I found copious new mate- 
rials to. enable me to prosecute the enquiry. 
The first step. 1 took was to get my young friend, Mr. 
CiESAR Hawkins, to examine and describe the- ganglions 
