642 
Proceedings of the Royal Society 
Dos Santos. By P. D. Handyside, M.D. Edinburgh, 1866. 
8 VO. — From the Author. 
Dublin International Exhibition, 1865 — Kingdom of Italy — Official 
Catalogue, illustrated with Engravings. Published by order 
of the Koyal Italian Commission. Second Edition. Turin, 
1865. 8vo. — From the Commission. 
Bulletin de la Societe de G-eographie. Tome X. Paris, 1865. 8vo. 
— From the Society. 
Bulletin de la Societe de G-eographie. Jan. Eev. Mars 1866. 8vo. — 
From the Society. 
Nova Acta Kegi^ Societatis Scientatis Scientiarum Upsaliensis. 
Vol. Y. Ease. 2. Upsala, 1865. 4to. — From the Society. 
Memoir of the G-eographical Survey of Great Britain, and of the 
Museum of Practical Geology. The Geology of North Wales 
by A. C. Kamsay, F.E.S., Local Director of the Geological 
Survey of Great Britain. With an Appendix on the Fossils, 
with Plates, by J. W. Salter, A.L.S., F.G.S. 8vo. London, 
1866. — Fro7n Professor Ramsay^ LL.D. 
Kelationen einestheils zwischen Summon und Differenzen und 
Anderntheils zwischen integralen und differentralen. Yon P. 
A. Hansen. 8vo. 1864. — From the Author. 
Monday, IQth April 1866. 
Dr CHKISTISON in the Chair. 
The following Communications were read : — 
1. Some Observations on Incubation. By John Davy, M.D., 
F.K.S., Bond, and Edin. 
In this paper its author describes the results of experiments 
made with two intents — one, to endeavour to ascertain whether 
there can be a complete arrest of vital action without the death of 
the egg; the other to ascertain the changes which take place in 
those instances in which, during incubation, the egg proves un- 
productive. 
The eggs used were chiefly those of the common fowl. The 
