182 F. W. Clarke on the Atomic Volume of Compounds. 
LiCl. Sp. gr. 1°998, Kremers. At. vol. found, 21°3. Cale., 22-0. Sp. gr. cale.,1'932 
“ ‘“ 27:2 “cc 27°5 ‘ be 2°127 
NaCl 2°145, Buignet. ff : 
KCl “ 1-945, Kopp. Z “ 383 % 385 6 & 16935 
AgCl “ 5-130, Herapath. “ “ 9879 « 875 4 5818 
Nabre.* 3-079, Kremers. ‘ WS Baa SD SRO : gests a 2 | 
Beer a 2°672, P. & J. e “ 445 44-0 as “ 2°704 
AgBr ' *8-6°0. ie 4 32-3-32'4 ' - 33:0 B69 
al = 3-450, Filhol. a pe ol Oy 0 i & —3°409 
* 3°056, Filhol. “ oe reeaa. 60 sap &~ S018 
Agl ~ 5-350, Schiff. 4 Wigs ABO geo %e “6341 
chlori 
greater than bromids. These regularities in difference between 
chlorids, bromids, and iodids, however, do not appear so dis- 
tinctly in other series of them. 
. Now, to sum up the important relations traced in this paper, 
bearing in mind that in many cases exceptions exist. 
First. When similar metals have equal atomic volumes, those 
of their similar compounds will also be equal. 
Second. Metals whose atomic volumes are unequal, but sim- 
ply related to one another, often form similar compounds hav- 
ing equal values. : 
Third. Some compounds have atomic volumes which stand 
in very simple relations to the sums of those of the free elements 
which form them. 
Fourth. Compounds formed by the union of similar elements, 
have atomic volumes which are multiples of the lowest for that 
group. 
And, fifth, we may add the multiple relations traced in my 
former papers, which not only connect the atomic volumes of 
different elements, but the various values for each single ele- 
m ’ ? 
established by them, it seems to me that one is decidedly hinted 
at. May we not say that in all compounds, the atomic volume 
of every element will be either a perfect multiple of the lowest 
value for that element, or of the lowest value in the a to 
which it belongs? Although this theory cannot be regarded as 
entirely proved, it certainly possesses a considerable degree of 
probability, and seems to harmonize well with the re ities 
which I have pointed ont. But why an element should have 4 
' 
