46 



INSECTICIDE STUDIES. 



SOAPS. 

 TABLE XI. Gniijn>xitiun <> 



The above analyses do not indicate that both soda and potash are 

 present, but show how much of either would be present calculated 

 from the number of cubic centimeters of normal acid necessary to 

 neutralize a known weight of soap. 



LYES. 



The compiled analyst's of a number of samples of lyes and the 

 results on one sample (No. 24 I & W) examined in this laboratory are 

 given in Table XII. 



TABLE XII. Composition o 



"The following constituents were also determined: L'.l )ier cent insoluble, and tl.l per cent silica. 



'The following constituent* were aNo determined: :',.f. per cent potassium clilorid, and 'J.7 per 

 cent insoluble. 



'The following constituent* were al-o found: o.oi', JUT cent of alumina and trace* of ferric oxid, 

 magnesium oxid, and insoluble. 



The mctho<l used for the analyst <>f the Koval Concentrated Lye 

 (No. '24 I cv \V) is as follows:" 



The ly<- is \vci'_Mic| in a wriuhini: Imttlt-, <li><olvr.l t<. :i .Irlinitc volunu- in rarlxm- 

 li.. xid-n-ft- \\atcr and alii|ti.t portions taken for analysis. I'licnolphthalcin is 

 juMnl to one of tlu'-t- portions ami N :; |.otas>iinn aci<l sulphate is inldnl at the rat.- 

 of aliout a drop per second, with constant stirrini: until the pink color fades and tin- 

 solution l.econies <-olorless. The nunilx-r of cc of N :', acj.l used, "n" repre*vnt- tin- 



a Cameron, r. s. Dept. f Ajrr., I>iv. of Soils lUil. 18. 



