322 Scientific Intelligence. 
As the writer has before said in these pages, the law of Avogadro 
is simply a mode of correlating facts, and its value as a scientific 
theory rests on the degree of certainty with which it points the 
to new discoveries. As soon as it begins to lead astray it 
will doubtless be abandoned, like many another philosophical 
guide before it. In order to invalidate the theory it is not enough 
i i hen 
P But nevertheless, 
before we can admit that the vapor of chloral hydrate contains 
only one-half as many molecules in the same volume as the vapor 
of chloral, it must be proved that the molecules of the hydrate, 
when in the state of vapor, have all the chemical constitution 
represented by the usual symbol as given above, and not only is 
no direct evidence offered on this point but the presumption is 
wholly against such a conclusion. J. P. Cis 3B 
13. Solubility of Lime in Water.—The fact that lime is more 
temperatures has been very carefully studied by M. A. Lamy. 
This French chemist finds that the solubility varies to a marked 
extent with the state of aggregation of the lime, with the material 
fr i : 
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rg 
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Temperature. fom alae wih [a ee ‘tae pied weg 
0° 1362 grams. 1-377 grams. 1-430 grams. 
10° 1309 1328“ 1384 
15° 29. © 1295 1345 =“ 
30° 1142 1158 1196: * 
45° 0985 1005 POs 2 
60° 0841 0-864.“ 0-385)“ 
100° O56 = 0575 « 0585 = 
In each case the numbers indicate the weight of lime contained in 
1000 grams of the solution, and we have selected this table from 
several others in the paper because as the author says the values 
