INSECTICIDE AND FUXGICIDE BOARD. 503 



fungi have been further developed and have beeniised to great advan- 

 tage as a quick means of detecting certain worthless fungicides and 

 also for the detection of active and inert ingredients of various types 

 of fungicides. Laboratory studies of the physical properties of the 

 various commercial Bordeaux mixtures, and also of home-made mix- 

 tures as affected by various methods of preparation, were made, and 

 considerable information for use in the enforcement of the act has 

 been gained concerning this subject. 



During the year the entomologists of the board have completed an 

 extensive study of the value of naphthalene as a remedy against 

 chicken lice, and a paper entitled " Naphthalene Against Chicken 

 Lice "' has been accepted for publication in an entomological journal. 



The special studies of proprietary remedies to be used against 

 chicken lice, chicken mites, and dog fleas, and the action of various 

 substances on these insects, were continued during the jenv. It is 

 planned to publish a paper on this subject during the present year. 

 A considerable amount of work has also been done on the coal-tar dis- 

 infectants to determine the dilution at which they will l)e effective 

 against various insects, and with pyrethrum stems to determine 

 whether they possess any insecticidal value. 



The entomologists of the board, in collaboration with the Bureau 

 of Entomology, have conducted field tests with various dust mix- 

 tures, with special reference to amounts to apply, different combina- 

 tions and time of application, and the resultant effects on insects and 

 action on foliage. Much work along the same line is planned for the 

 future. Extensive field tests have also been made to determine the 

 value of dry or powdered substitutes for liquid lime sulphur. In- 

 formation of much value in connection with the enforcement of the 

 act was obtained. 



The scientists of the board, working under the direction of tlie 

 Bureau of Animal Industry, have made investigations relative to the 

 state of water in cresol compounds, Avhich are used as insecticides and 

 fungicides. These investigations were proposed to establish the fact 

 on physical chemical grounds that water was an inert ingredient in 

 these compounds. 



In connection with the zoological division of the Bureau of Animal 

 Industry, investigations relative to the effect of carbon bisulphid as 

 a remedy for bots and worms infesting horses have led to conclusions 

 which warrant giving advice to manufacturers relative to the label- 

 ing of products designed to stop infestations by these parasites. 



A special study of apparatus for quantitative analysis by sul:)lima- 

 tion led to a new form of apparatus for this method of analysis, a 

 description of which is being prepared for publication. 



