and some of its Products of Decomposition. 377 
With nitrate of suboxyd of mercury, it gives a precipitate of 
metallic mercury. 
From a concentrated solution in diluted spirits of wine or in 
water, in process of time large prismatic crystals are formed, which 
apparently belong to the monoclinate system, of the combi- 
nation » P.OP.+P.2 Px». Prof. Kopp, to whom I am indebted 
for an examination of these crystals and of several others of salts 
of glycocoll, obtained from crystals prepared by Prof. v. Liebig, 
an admeasurement of the sharper angles of » P, (through which 
the orthodiagonal passes, ) giving 664°. 
The combustions for carbon and hydrogen were made with 
chromate of lead; those for nitrogen, according to the method of 
Varrentrapp and Will,— ; 
I. 0-6770 grm. gave 0-7940 carbonic acid and 0-4170 water. 
me 5576 os 06607 es ©, Me OSRT4A. 
IIL 0:-4670 “ “  0:5455 ff HagitteO Gear 
IV. 0:4003 #6 “ 09-4686 &“ é “« 02478 ‘< 
. 01338 “  “ . 0-4100 platin-salammoniac. 
ee C1987: a. 56 AG ee # 
These determinations correspond in per cent. with - 
I. ae ul. Iv. v. vi. 
Carbon, 31:89 32:31. 31:1 31°92... ; 
Hydrogen, 6°34 6°92 685.687... .. 
Nitrogen, . . oe airy exarc hb Qt “+ 18:36 
From these may be derived the formula, 
C 
,HO 
as will be seen by comparing the estimated and average actual 
per cents. of the several elements. 
Theory. | Experiment. 
WRT ee 4 equiv. = 24 32-00 31-98 
ees Bo ee DB 6-66 6:87 
Wea ger aad 1366 | 1879 
; 4 * =32 4268 | 42:36 
75 100-00 | (100-00. 
_ The atomic weight of glycocoll is, with the above constitu- 
fon, 66. . 
Giycocot, AND Hyprocnioric Act. 
Neutral Hydrochlorate of Gilycocoll. 
s Gl HCl HO. am ones 
is is the product of boiling hippuric acid with concen 
hydrochloric aia as already deacribed. If the filtrate, page 376, 
be carefully evaporated to syrup consistence, and suffered quietly 
to cool, the whole mass becomes filled with groups of long, flat 
prisms, perfectly transparent, and of the greatest brilliancy. ‘The 
mother liquor poured off, and the crystals washed with spirits of 
wine, gives the salt in the utmost purity. A second and thir 
Szconp Series, Vol. III, No. 9.—May, 1847. 48 
