112 
lOcwt. each, had fallen. The statement at p. 96, in which I 
am made to differ with Mr. Tiddeman as to the presence of 
the pleistocene mammalia inside the cave is altogether 
unfounded, and the inference that I “ varied my description” 
after my paper came before the Society is negatived by the 
fact that the abstract in question was printed for private 
circulation in 1872. The remains occur at the entrance and 
extend both inside and outside the cave, as I pointed out 
in my diagram. These are merely two out of many points 
which have been raised, and which do not lead me to alter 
my conviction that the stratum containing the mammalia is 
of preglacial age, or to undertake any responsibility as to 
the views which I have not advanced. Were I to discuss 
all the points which have been raised, I should anticipate 
the Report of the Committee to the British Association. If 
these hasty and necessarily imperfect observations were not 
calculated to throw discredit on the Exploration, I should 
not trouble the Society with this note. 
“ On some Improvements in Electro-Magnetic Induction 
Machines,” by Henry Wilde, Esq. 
[An abstract of this paper will appear in the next number 
of the Proceedings.] 
MICROSCOPICAL AND NATURAL HISTORY SECTION. 
Extraordinary Meeting, December 11th, 1872. 
Joseph Sidebotham, F.R.A.S., in the Chair. 
Mr. James M. Spence exhibited a large and interesting 
collection of natural history and other objects from Vene- 
zuela. Mr. Spence had lately returned from that country, 
in which he spent eighteen months, during which time he 
accumulated a very extensive collection. 
The natural history collection contained a number of 
hunters’ skins of the larger animals of prey and of the chase ; 
but the great wealth and beauty of the fauna of the country 
was best illustrated by the extensive collection of birds, 
