614 NEW JEESEY AGEICULTUEAL COLLEGE 



believe the formula giving fifty pounds each of lime, salt and sulphur 

 to 150 gallons of water to be the best, though little is lost by reducing 

 the amount of salt by one half. 



The caustic soda combination seems to have been little used, and 

 the only definite record that I have is of the application made on the 

 College Farm and recorded in the general review, 



Napthol-Sulphur. 



As the sulphide preparations have proved to be effective scale de- 

 stroyers, and one of the chief objections to their use is the task of 

 preparing them, it is natural that chemists should try to get a con- 

 centrate that would simplify the use of the material. 



A small sample of Napthol-Sulphur, in paste form, was sent in, and 

 applied March 6th, on a bright, sunny day, with a moderate wind, on 

 trees 19, 20, 31, 32, 33, 34, 42, 44 and 47 of the Experiment Orchard. 

 The dilution w^as, as recommended, to give the theoretical strength of 

 the normal lime, salt and sulphur wash. It mixed easily in water, 

 sprayed freel}^, and left the trees with a greenish-gray covering. The 

 application was well made, and the drip discolored the snow to a uni- 

 form yellow. Trees 32, 33, 34, 44 and 47 had been sprayed in Octo- 

 ber with Kill-0-Scale, and must be left out of consideration in esti- 

 mating the value of this mixture. 



June 25th, the trees were examined and no appreciable benefit was 

 noted — indeed, tree 19 shortly became the worst on the place, and 

 received early summer treatment. The results were not encourag- 

 ing in any case, and no further attempt to use the material was made. 



Soluble Petroleum. 



There are at present four distinct forms of what may be roughly 

 termed soluble petroleum upon the market, differing somewhat in the 

 percentage and grade of oil used and in the emulsifying agent, ir 

 we include the "Textil Oil," which is not primarily intended as an 

 insecticide, there are five. All of these combinations mix readily 

 with water, form a milky emulsion and spray and cover perfectly. 



The composition of "Kill-0-Scale," of "Scalecide" and of the 

 "Target Brand Scale Emulsion," I know, approximately, from the 

 makers, and these I have tested personally, more or less thoroughly. 



