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Proceedings of the Boyal Society 
apparatus. The results were now only about 5 per cent, different 
from those obtained in the Triton.” There could he no essential 
difference between the two sets of home experiments, except that 
the first set was made in July, the second in Kovemher, — while the 
temperatures at which the greatest compressions were reached in the 
“ Triton ” were at least 3° C. lower than those in the latter set. 
Hence it seems absolutely certain that water becomes considerably 
more compressible as its temperature is lowered, at least as far as 3° C. 
(the “ Triton ” temperature). This seems to be connected with the 
lowering by pressure of the maximum density point of water, and I 
intend to work it out. It is clear that in future trials of such 
manometers some liquid less anomalous than water must he 
employed. 
Another preliminary result, by no means so marked as the above, 
and possibly to be explained away, is that by doubling (at any one 
temperature) a high pressure we obtain somewhat less than double 
the compression. This, however, may be due to the special con- 
struction of the manometer, which renders the exact determination 
of the fiducial point almost impossible. 
5. Hote on an Application of Mendeleieff’s Law to the Heats 
of Combination of the Elements with the Halogens. By 
Mr A. P. Laurie. Communicated by Professor Crum 
Brown. 
Monday, Ibth January 1883. 
Peofessor MACLAGAH, Vice-President, in the Chair. 
The Chairman, in accordance with the Laws, announced to the 
meeting the names of proposed new Foreign and British Honorary 
Fellows, to be submitted for Ballot at the Second Meeting in 
February, viz . — As British Honorary Felloius : — Sir Joseph Dalton 
Hooker, Dr William Spottiswoode, Professor Alexander William 
Williamson, Colonel H. Yule. As Foreign Honorary Fellows : — 
Professor Luigi Cremona, Dr Julius Hann, Professor Charles 
Adolphe Wurtz. 
