36 ACTION OF HALOGEN COMPOUNDS OF ETHYL AND AMYL 
soluble in boiling water, but when cold, this liquid dissolves but little of the salt. 
The following is the analysis :— 
5173 age dried at 212°, gave 
10-840 carbonic acid, and 
1.( 2°755 .,. water. 
5885 ... dried at 212°, gave, on ignition, 
0:938 ... sesquioxide of chromium. 
4:480 +. dried at 212°, when ignited, gave 
{ 0-715 ... sesquioxide of chromium. 
Experiment. Calculation. 
—_—_—_—_ —_— 
Ts II. 
Carhons seit) se) Bist 57°33 C,, 276 
Hydrogen, . 5°91 581 H,, 28 
Nitrogen, . . . . 581 8 N, 28 
Oessam cl eee ce 29°99 OF 48 
Chromic acid,. . . 20°86 20-88 21:06 2(6r0,) 101-4 
100-00 100:00 100-00 481" 4 
which gives results according satisfactorily with a formula which contains an 
atom of water more than those of the corresponding potass and ammonia salts, 
and may be thus written :— 
C,, H,, N, 0, HO, Cr0,, HO CrO, = C,, H,, N, 0, CrO,, H CrO,. 
The failure of the analogy here, with the peculiar combinations of potass and 
ammonia, is worthy of attention ; of course, it readily admits of explanation, if 
the one atom of water be assumed as retained from the water of crystallization 
of the new salt. The loss sustained by exposing the crystals to heat was as 
follows :— 
7 { 4-660 grains, lost at 212°, 
0-160 ... water 
11°510 ... lost at 212°, 
us 0-435 ... water 
ib I. 
Percentage of water, 3°43 3°77 
and 8°60 is the calculated percentage corresponding to a loss of two atoms of 
water by a salt of the formula,— 
C,_ Ho, N, 0, OrO,, H CrO, + 2 aq. 
Platinum Salt of Ethylostrychnine.—By the successive addition of nitrate of 
silver and hydrochloric acid to a warm solution of the iodide, and that of bi- 
chloride of platinum to the clear fluid, this salt fell as a curdy yellow precipitate, 
which became crystalline after some hours; from more dilute liquids it crystallizes 
at once in a very beautiful form, namely, in groups of stars, of which the individual 
—— 
