450 Report OF INSPECTION WORK OF THD 
There are given in addition, analyses of Arsenoid, Paragrene, 
Black Death, Bug Death, and Hammond’s Slug Shot. 
INTRODUCTION. 
During the year 1900, there were collected for analysis twenty: 
two samples of materials sold as Paris green, and also one sam- 
ple each of Arsenoid, Paragrene, Black Death, Bug Death and 
Hammond’s Slug Shot. Of the twenty-two samples of Paris 
green analyzed, ten represent firms whose goods were not exam- 
ined by us in 1899. | 
CHEMICAL COMPOSITION OF PARIS GREEN. 
Paris green, or copper aceto-arsenite, may be regarded, when 
chemically pure, as containing approximately 
Copper arsenite +. jcticshste <b%eel wee ols bl ale « of¥ bila SLs 82 per ct. 
Copper: ACETATE a iiisas oa once ine © ee ee ns eet TS oe 
However, it is customary, when speaking of the amount of 
arsenic contained in Paris green, to refer to it as.arsenious oxide, 
and similarly the amount of copper is referred to as copper oxide. 
Arsenious oxide, as such, and copper oxide, as such, are not pres- 
ent in pure Paris green, and the use of these terms in giving the 
results of chemical analysis is simply a convenient custom. Using 
the usual form of expression, as thus explained, we should give 
the composition of pure copper aceto- arsenite as follows: 
ATSENIOUS XT E sus te vs ca dels o ohdie are aia teas aoe ee 58.64 per ct. 
COPDELIOXIUG ls vs ao cds 4 Se pee ae a wee mass ae ieee SLLOUL eee 
Acetié: decid GUA SIO, ORG aR eta ene 10.06 “ 
When we say that this compound in pure form contains 58.64 
per ct. of arsenious oxide, we mean that the amount of arsenic 
present simply is equivalent to the quantity of arsenious oxide 
stated, and not that arsenious oxide is present to that or any 
other extent in the compound known as copper aceto-arsenite. - 
Now, Paris green, as found in the market, rarely, if ever, con- 
sists entirely of pure copper aceto-arsenite, but contains this 
