New YorK AGRICULTURAL EXPERIMENT STATION. 227 
LonpDON PURPLE. 
AAT SRINIOUS MOXIE p46 cc ves horas ck Reagan eR Pate els Se, ke! sya, « 32.32 per ct. 
Weater-sOlUle + ATSENIOUS OXIGere a eeeten et tere stair vicne ole oc 12 272 ence 
PARAGRENE. 
Total arsenic equivalent to arsenious oxide....... S625 to = ~52.30° per ct. 
Water-soluble arsenious oxide..............000s+ 0.88 to 1.47 per ct. 
Copper equivalent to. copper oxide...:......0.... 17.87 to 21.06 per ct. 
Calcium equivalent -toccaleium xidexthime)s seer sete s : 14.20 per ct. 
IVI Gist rewire, cake et. Mad Ok cP clea eietot cL ae Ae meen Pate ee 8.15 per ct. 
PP ROUIGIS RICE CO. trot sss Gia a oleane de wcele Bk CaS RU) rape ieaeaig as 15.49 per ct. 
Wiateresoinbie sat seniouss ONlde> corre. uitectte. See ae tele Oe oh 1.72 per ct. 
Copperas Oxide stent Pad oo tad Mobile Peer ne eee mere er 16.02 per ct. 
SmItTH’s ELEcTRIC VERMIN EXTERMINATOR. 
This is a mixture consisting chiefly of carbonate and hydrate of 
lime. 
ANALYSES OF COPPER COMPOUNDS USED IN SPRAY- 
DN Gaal UN Ese 
An investigation was undertaken to ascertain whether the copper 
compounds used in making spraying mixtures are adulterated and 
whether the special preparations put on the market are pure, prop- 
erly mixed and economical in price. The following materials were 
examined: Copper sulphate in the form of crystals, powdered, and 
dried or anhydrous; copper carbonate as precipitated and “ hy- 
drated ;” a prepared mixture called “ copperdine ” in dry form and 
in solution; and a prepared bordeaux mixture. 
The samples of copper sulphate crystals contained 98.1 to 99.6 
per ct. of pure copper sulphate. Powdered copper sulphate con- 
tained 98.1 per ct. The dried copper sulphate contained about 80 
to go per ct. of what it should contain if entirely free from water 
of crystallization. 
The samples of copper carbonate contained from 60 to 90 per 
ct. of pure copper carbonate. . 
“Copperdine ” is a mixture of ammonium carbonate and copper 
carbonate. It was found to be needlessly high-priced. 
A “Prepared bordeaux mixture” was found to contain only 
three-fourths as much copper as-it should. 

* Bulletin 41, 
