— 

New York AaricunruraL ExpERIMENT Sration. 393 
Samples of four different kinds of materials have been examined, 
as follows: 
1. Copper sulphate in three different forms. 
(a) Crystals of copper sulphate. 
(0) Crystals of copper sulphate, powdered. 
(c) Dried or anhydrous copper sulphate. 
2. Copper carbonate in two forms. 
(a) Precipitated copper carbonate. 
(0) “Hydrated” copper carbonate. 
3. A prepared mixture called “ Copperdine,” as put up for 1891 
and for 1892. 
(a) Copperdine in dry form. 
(b) Copperdine in solution. 
4. A sample of prepared Bordeaux mixture. 
PROPERTIES OF Copper SULPHATE. 
In order that some of the points connected with the analysis of 
the various samples of copper sulphate may be more clearly 
understood, a few statements are made regarding some of the 
properties of copper sulphate before presenting the results of 
analysis. 
Copper sulphate, commonly called blue vitriol, blue stone or 
copper vitriol, may occur in three forms or conditions. In the 
form with which we are most familiar, it appears in crystals, 
varying in size, of a beautiful blue color. Oné hundred pounds ce 
of it contain the following amounts of different elements : 
Pounds 
MPI fr, 2 Hee Gees ich oe ae PUR AR a Nlig elidel each ON FAk teya/3(5 6 25.4 
BURR TM REM aa tute) Ne cat haita a a's uct ANG! che Ms ioilace Shelgia @'w ara Roane 12.8 
AR aes via Par acta cher sd LS les Dallann) ny 9 b) olin eV QUA! el yal dha lg niu esata love) Sy aaa 57.8 
PUVPO EOD oy tine alata Geib areal a Sole AIG slain Sa/tehac ia Ubie's Qe woke sere 4.0 
The four pounds of hydrogen are combined with thirty-two 
pounds of the oxygen, forming thirty-six pounds of water, which 
is known commonly as water of crystallization. The remaining 
25.8 pounds of oxygen are combined with the sulphur in the same 
‘manner as in sulphuric acid, and the oxygen and sulphur, com- 
bined with the copper in the proportions above given, together 
with the water, form crystallized copper sulphate. Stating its 
: 50 
ot Sry ama 
NS 
“ MS 

