86 
Proceedings of the Royal Society 
bars are of equal length they are not intended to represent equal 
forces. We have no unit for comparing the values of the unit 
affinities in different atoms, and they may be incommensurable. In 
filling up the places of attachment we saturate the fixing powers 
of the individual atoms, taking no account of the influence the 
different elements and radicals have in affecting the energy of 
the whole compound. Without entering into any detail on the 
structure of the hydrocarbons, to show the ease with which the 
instrument can represent the same hydrocarbon in different ways, 
seven formuke of benzol are appended. To show the latent affini- 
ties, all we have to do is to open the bars connecting any two atoms. 
To show the six latent affinities in benzol, as represented in a 
closed circuit, we have merely to separate the bars a little, when we 
have six free places on the outside, and six in the inside. By 
opening the whole arrangement we get fourteen free affinities. 
Naphthalin and many other hydrocarbons give elegant symmetrical 
diagrams when represented as a closed circuit. 
The following Gentlemen were elected Members of the 
Society : — 
Thomas R. Fraser, M.D. 
Thomas Annandale, F.R.C.S. 
D. R. Haldane, M.D., F.R.C.P.E. 
The following Donations to the Library were announced: — 
Transactions of the Pathological Society of London. Yol. XVII. 
London, 1866. 8vo. — From the Society. 
Monthly Notices of the Royal Astronomical Society, London. 
Yol. XXVII. No. 2. 8 vo.— From the Society. 
Transactions and Proceedings of the Royal Society of Victoria. 
Yol. VII. 8 vo. — From the Society. 
Journal of the Royal Asiatic Society of Great Britain and Ireland. 
New Series. Yol. II. Part 2. London, 1866. 8vo. — From 
the Society. 
Journal of the Asiatic Society of Bengal. Edited by the Natural 
History Secretary. Part 2, No. 2. Calcutta, 1866. 8vo. — 
From the Society. 
