14 



GRANITE AND C.WE DEPOSITS. 



2075-2077. I. Ground granite, received from East Milton, Mass. 

 II. Cave deposits, received from Northampton, Mass. 

 III. Stalactite from cave in Va., received from North- 

 ampton, Mass. 



PER CENT. 

 I. 



Moisture at 100° C., 



Nitrogen, 



Potassium oxide. 



Phosphoric acid. 



Calcium oxide. 



Ferric and aluminum oxides. 



Magnesium oxide. 



Carbonic acid. 



Insoluble matter, 



The potash in the ground granite was wholly insoluble in distilled 

 water. We would caution the users of commercial fertilizers against 

 purchasing feldspathic rocks as a source of potash. Sample No. 

 2 is an earthy deposit impregnated with carbonate of lime. Sample 

 No. 3 is largely carbonate of lime. 



INSECTICIDES. 



2078-2081. I. Arsenate of lead, received from Boston, Mass. 



II. Paris green, received from Westport, Mass. 



III. Acetate of lead, received from Boston, Mass. 



IV. Arsenate of soda, received from Boston, Mass. 



Moisture at 100° 

 Lead oxide, 

 Arsenious oxide. 

 Copper oxide. 

 Acetic acid, 

 Insoluble matter. 

 Sodium oxide. 

 Potassium oxide, 

 Chlorine, 



C, 



32.10 



1. 00 

 35-oc> 



