66 Prof. E. N. Horsford on Gilycocoll, 
Glycocoll and Hydrate of Baryta. 
It has already been mentioned, that glycocoll rubbed with pul- 
verized hydrate of baryta, in a mortar, becomes almost instanta- 
neously semifiuid. Upon diluting the solution, and setting aside, 
after a time crystals containing both baryta and glycocoll were 
deposited. The salt was not analyzed. Its composition, in al 
probability, corresponds with that of the oxyd of copper, silver 
and lead, noticed below, and there exist, doubtless, similar salts 
of strontia, lime and magnesia. 
Glycocoll and Oxyd of Copper. 
a solid mass of the most exquisite cerulean blue color. More 
carefully examined, it is found to consist of exceedingly delicate 
needles. The addition of absolute alcohol to the concentrated 
solution precipitates the whole salt ; to the diluted, less perfectly. 
At 100° C. [212° F.] 0:5443 grm., at the conclusion of seve 
days, had lost 0:0438 grm. =8-04 per cent. =one atom of water. 
_ With this loss the color passed through a light green toa shade 
in which a lavender or violet tint is discernible. 
he analysis was made with the substance dried in the air over 
sulphuric acid. 
- Combustion with chromate of lead gave the following fe 
sults :— ’ 
I. 02030 grm. of substance gave 0°1538 grm. carbonic acid and 
0:0912 grm. water. 
II. 0:2373 germ. by the method of Varrentrapp and Will, gave 
st lies grm. platin-salammoniac. 
II. 0:1745 grm. gave 00592 grm. oxyd of copper. 
IV. 0:2871 grm. gave 0-0972 poe ne of caphe | 
Which expressed in per cent. give 
It Ill. IV . 
Carbon, 20°66 sits 
Hydrogen, 4:99 lvoe 
Nitrogen 12-65 
Oxyd of ‘copper, 33-85 33-92 
These give the formula C,H, NO,, CuO, HO, as will be 
seen by comparing the theoretical and analytical results. 
