80 THE CANADIAN ENTOMOLOGIST. 



lbs., and this air under pressure is conducted into a second tank contain- 

 ing the spray. The apparatus is furnished with an attachment of 12 

 nozzles set at intervals of 8 and 10 in., and according to the representa- 

 tions of the manufacturer a pressure of r6o lbs. is sufficient to spray 50 

 gals. The pressure may be maintained by connecting the apparatus by 

 gearing with the wagon wheels. According to the experience of a number 

 of the members present, however, this apparatus is still quite defective, 

 and requires numerous modifications before it can become of real practical 

 value. 



A letter from Mr. Tepper, of South Australia, to Dr. Howard was 

 read before the Club. In this letter the efficacy of kerosene in killing 

 mosquitoes was questioned. It was argued that there are various natural 

 agencies which prevent undue prevalence of mosquitoes. Kerosene, 

 however, was once tried by the writer with good results. Considerable 

 importance was attached to the action of mosquito larvaj in preventing 

 stagnant water from becoming putrid. Apropos of this letter mention was 

 made by Dr. Fairchild of acetozone, which is claimed by the manufacturers 

 to be one hundred thousand times more powerful than peroxid of hydrogen 

 as a disinfectant. It was suggested that this substance might be tested in 

 killing mosquito larvae. The value of formalin as an insecticide was also 

 discussed, but in the experience of a number of members its power had 

 proved very slight. 



Mr. C. P. Gillette considered it very undesirable to use an excess of 

 lime with Paris green in spraying for the codling moth, and attention was 

 called by other members to the fact that Kedzie's formula for arsenite of 

 lime is extensively used for this insect. 



Doctor Fairchild reported the use of an unknown fluid mixture by an 

 orange-grower in Florida for the purpose of influencing the maturity of the 

 oranges. Oranges thus treated become sweet and mature, in so far as the 

 flavour is concerned, while they are still green and before they have 

 matured in appearance. The proprietor of this method is thus able to 

 ship green oranges and secure a higher market price than for oranges 

 which have not been so treated 



Dr. Fletcher enquired if an.yone had had experience with Fuller's 

 carbolic insecticide, and stated that good results had been obtained in 

 Canada from the use of a mixture, said to contain carbolic acid, oil and 

 Stockholm tar, in combating San Jose scale. Prof Lochhead spoke to 

 the same effect. Professors Piper and Gillette had noticed the burning 



