372 Prof. E. N. Horsford on Gilycocolt, 
[304° F.] When exposed upon a watch crystal to the heat of a 
lamp, with a metallic screen between, and at such distance that 
the escape of vapor is barely discernible, a part of the mass in 
contact with the glass becomes browned, while another portion 
melts and shoots into crystals. ‘These continue to form even 
after other portions have become charred. Rubbed together with 
ely pulverized hydrate of baryta, it becomes almost instantly 
fluid, the whole dissolving readily in water, from which, in pro- 
cess of time, crystals containing baryta and glycocoll deposit 
themselves. Here, in the act of combination, the water from 
one or both the ingredients was given up. ’ 
The above circumstances, and others yet to be noted, induced 
the opinion that at a certain temperature, a lower one longer con- 
tinued, an atom of water from one half of the hydrated glycocoll 
might be given up, and the remaining half take its place. This 
would give almost precisely the analytical results of both Mulder 
and Boussingault, and yield from the formula determined on by 
us, precisely the composition given by Mulder. 
4 2(C,H, NO,, HO)}—HO=C,H,N,0;.... 
Below, follow the estimated per cent. constitution, according to 
the above formula, and the average of a series of analyses by 
Boussingault and Mulder. iM 
| | Estimate. | _ Bous. Mulder. 
8 equiv. Carbon, apse rr S99 34:1 
9. Hydrogen, i z 6-38 6-44 
2 Nitrogen, As gs 19-85 9-90 
7M * Oxygen, | - : 39-73 39°70 
100-00 1 100-00 
The effort to expel this half atom of water was unsuccessful, 
A temperature of 150° C. [302° F.] produced scarcely a percep 
tive diminution in weight. At 170° C. [338° F°.} it began to 
rown with the escape aseous products of decomposition. At 
190° C. [374° F.] though portions had become quite ¢ ) 
others had merely melted and crystallized anew. 
The support which the analyses of Boussingault give to the 
formula C,H, NO,, HO, fee 
will justify the following juxtaposition of the estimated per cents. 
and the actual results. ‘ 
Glycocoll and Oxyd of Silver ; dried at 110° C. [230° F.] 
} Boussingault. orsfo : f 
bas Ci6H,5N40, ,+4Ag0. Ca Hy NOg+Ag0._ 
uiv. Estimate. quiv. a ech 
perbe “ ~~ 1s 4 == : 
drogen : 4 = 19 
Nitro ; ‘ Pi 8- LL = a4 . “OW 5 
Uxyge! . - ee ae 
Ox, Dicer: i ‘ | 6 re Tek 
ne. ¥ | 7 
ol __ 108 
