62 INSECTICIDES AND FUNGICIDES. 



This showed that Mr. Lucas had improved his process since making 

 the sample, the analysis of which has already been given. 



[Serial No. 19617.] 



We have ceased to manufacture this article. 



THE NICHOLS CHEMICAL Co. 



[Serial No. 20458.] 



I should judge the sample you had must be an old one from the small percentage 

 of water present. How there should be such a large amount of unsaponifiable mat- 

 ter I can not understand, unless the presence of petroleum has acted on the fatty 

 acids used. When the soap is made a mixture of fat oils and resin is saponified 

 nearly neutral and 25 per cent of the entire weight of the finished mass in kerosene 

 oil is added. 



You may have had some of the crude oil soap which had 25 per cent crude Penn- 

 sylvania petroleum in it. 



POOLE & BAILEY. 



Comment ty chemist: The sample examined so evidently consisted 

 of soap and unsaponifiable matter, resembling paraffin, in the propor- 

 tions given in the table, that a sample was forwarded to Poole & Bailey 

 for analysis if they so desired. No reply was received. 



[Serial No. 22289.] 



This material should average 30 per cent nicotine. 



SKABCUBA DIP Co. 



[Serial No. 20482.] 



We use the best commercial white arsenic. Some few years ago we used one-third 

 barium carbonate; now we use one-seventh barium carbonate, and we shall soon dis- 

 continue it altogether. 



E. S. WELLS. 



[Serial No. 13 I & W.] 



Chloronaptholeum is prepared from coal-tar creosote, which is obtained by frac- 

 tional distillation of coal tar. After all the light oils have been distilled, they are 

 collected separately and cooled by means of refrigerators, and then redistilled until 

 all the impurities and free carbon have been eliminated. The oil has then the 

 required specific gravity, and is free from carbolic acid. It is then treated in the 

 presence of resin and fatty matter by means of alkali, containing a certain percentage 

 of sodium chlorid, when a light-brown finished fluid is obtained. 



WEST DISINFECTING Co. 



Farmers and others desiring to have work done similar to the above 

 should apply to the Bureau of Chemistry, laboratory of insecticides 

 and agricultural waters, U. S. Department of Agriculture, Washing- 

 ton, D. C., for directions for taking and forwarding samples. 



