28 THE MONTHLY BULLETIN. 



STOCK SOLUTIONS. 



Formulae for the homemade emulsions used in the preceding table. 



Plat 7. — Asphalt emulsion. The stock solutiou by volume is as follows: 



Water 2 parts 



Cresol soap 5 parts 



Oil, 14° Baume 25 parts 



Dilute stock solutiou 1 to 7 of water for use. 

 Plat I'l. — Homemade distillate oil emulsion. Stock solutiou by volume : 



Water 2 parts 



Cresol soap 5 parts 



Distillate oil 26°-29° Baume 25 parts 



Stock solutiou dilute 1 to G for use. 

 Plat 16. — The same formula was used as for Plat 4, except solution was diluted 1 to S 



and "Black Leaf 40," 1/1000 was added. 

 Plat 18. — Distillate gasoline emulsion. Stock solutiou by volume: 



Water 1 part 



Cresol soap G parts 



Gasoline S parts 



Distillate oil 26°-29° Baume 17 parts 



Stock solution diluted 1 to 12 for use. 

 Plat 33. — Asphalt emulsion. Stock solution by volume, same as for plat 7. 



DISCUSSION OF RESULTS. 



Of the oils and oil einitlsions used Yel-Ros and Miseible Oil No. 2 

 were made from high gravity oils rnnning from 38° to 41" Banme. 

 Miseible Oil No. 1, Distillate Oil Emulsion, Asphalt Emulsion, and 

 Crude Oil Emulsion were all from heavy oils running from 29° Baume 

 down to 14° Baume. 



The Distillate-Gasoline Emulsion was a combination of high gravity 

 and low gravity oils, the theory being to have the high gravity oil for 

 penetration and the low gravity oil for lasting effect. 



In all of the miseible oils it might be said these were emulsified by 

 cresol ating the oils and all the oils used were made from an asphalt 

 base. 



It will be seen that practically everything gave good control in a 

 commercial w^ay except the Yel-Ros and the Miseible Oil No. 2 when 

 used by themselves. Both of these products are primarily intended 

 in ordinary use as spring and summer contact insecticides against 

 aphids, etc., and are of too high gravity for winter application, the oil 

 from which they are used being similar in gravity to various types 

 of kerosene, xylene, toluene, etc. 



It seems apparent from the results of the tw^o products and the use 

 of Kerosene Emulsion in the eastern states, that oil sprays made from 

 high gravity oils do not have the lasting effect to be used as wnnter 

 sprays for aphis eggs unless used at very high strengths which make 

 the cost prohibitive. 



There is practically little to choose from in the results from com- 

 mercial Crude Oil Emulsion 1 to 9 and 1 to 4 strengths ; ]\Iiscible Oil 

 No. 1, 1 to 12, 1 to 9; commercial Distillate Oil Emulsion, 1 to 20 to 

 1 to 12; homemade Distillate Oil Emulsion, 1 to 6, 1 to 8, and Asjihalt 

 Emulsion, 1 to 7. Also commercial Lime Sulphur solution, 1 to 7, 

 combined with Black Leaf 40, 1 to 1000: Distillate Oil Emulsion, 

 homemade, 1 to 8, combined with Black Leaf 40, 1 to 1000; Lime 



