February, "15] DEAX AND XABOURS: AIR COXDITIOXIXG APPARATUS 107 



had penetrated the bark and the borers had tried to escape. In the 

 use of the two substances mentioned there was no apparent injury to 

 the trees. 



Secretaey a. F. Burgess: I would like to ask Dr. Headlee if both 

 ■old and young peach trees were injured by tanglefoot? We are using 

 large quantities of this material each year and seldom notice any 

 injur}', although we very rarely appty this material to peach trees. 



Mr. T. J. Headlee: The tanglefoot was applied both to young 

 trees with thin tender bark and to old trees with rough heaw bark in 

 bands about eight inches wide, beginning two or three inches below 

 the surface of the soil and extending five or six inches above. The 

 j-oung trees first exhibited injury, but sooner or later practically all 

 succumbed. 



President H. T. Ferxald: If there is no further discussion, we 

 will take up a paper by George A. Dean and R. K. Xabours. 



A NEW AIR CONDITIONING APPARATUS 



By Geo. A. Deax, Entomologist, and R. Iv. Xabours, Zoologist, Kansas Agricul- 

 tural College and Experimsnt Station 



Within the last ten years the influence of moisture and temperature 

 on animal life has received considerable attention. It is not necessary 

 to emphasize the value and the absolute necessity of accumulating 

 data relative to this important phase of entomological and zoological 

 work. The difficult}^ in this work has been to devise or to secure some 

 sort of an air conditioning apparatus that would maintain a desired 

 constant humidity and temperature within a reasonable degree of 

 variation. Different individuals have devised various machines and 

 incubators for this purpose, but to the knowledge of the writers they 

 have all proved more or less unsatisfactory. For several years the 

 departments of entomology and zoology of the Kansas Experiment 

 Station have been building and experimenting with various moisture 

 and temperature control apparatus. Last spring at the suggestion 

 of Professor Potter, of the Engineering Division, it was decided to take 

 the matter up with some air conditioning specialists. After conferring 

 with several companies a contract was made with the Carrier Air 

 Conditioning Company, of Buffalo, N. Y. The plan was to construct 

 and install a machine that would automatically condition the air 

 before it entered the breeding chamber, flow it into the breeding 

 chamber continuously and at a rate that would make a complete 

 displacement of the air at least every minute. 



Just recently the air conditioning machine has been installed and 



