February, '11] SHAFER: INSECTICIDE EFFECTS 47 



ate membership and active membership, if any of you has a friend 

 whom he thinks shouhl be raised to active membership, who is now 

 on the associate hst, please do not mention that fact incidentally to 

 members of the committee, but supply the committee with information 

 in writing, giving a list of his pubhcations. . Certainly, if you cannot, 

 in the case of a man you know well enough to wish raised, give infor- 

 mation concerning him, you cannot expect us to furnish that infor- 

 mation here in the brief time allowed. 



By vote of the association the session adjourned. 



Afternoon session, Wednesday, Dec. 28, 1910. 



The meeting was called to order at 1.30 p. m. by President Sander- 

 son in joint session with the Entomological Society of America.^ 



President Sanderson: The next paper is on "The Effect of 

 Certain Gases and Insecticides upon the Activity and Respiration of 

 Insects," by G. D. Shafer, East Lansing, Mich. 



THE EFFECT OF CERTAIN GASES AND INSECTICIDES UPON 

 THE ACTIVITY AND RESPIRATION OF INSECTS- 



{Abstract) 

 By G. D. Shafer, East Lansing, Mich. 



This paper, as well as the one following on lime-sulphur is a brief 

 of results of some work done on the general subject of how Contact 

 Insecticides kill insects. Early in the study of this subject, it was 

 found that scarcely any insecticide depends upon only one property 

 for its effectiveness. Yet, as a rule, some one property is chiefly con- 

 cerned. For example, strongly alkaline washes enter the spiracles or 

 penetrate the chitinous covering into the body of the insect and dis- 

 solve the fat and proteid portions of the tissue cells. Substances 

 commonly used as fixing agents in histological studies such as corrosive 



iThe following papers were presented and will be published, together with the dis- 

 cussions thereon, in the Annals of the Entomological Society of America; "Some 

 Notes on the Pear Slug, Eriocanipoides limacina Retz." by R. L. Webster, Ames, 

 Iowa, and "The Locomotion of the Larva of Calosoma sycophanla," by A. F. Burgess, 

 Melrose Highlands, Mass. 



^A more complete account of work mentioned in this paper, as well as the paper 

 on Lime-Suli)hur Wash, together with figures of apparatus, tabulated data, etc., will' 

 be published shortly in a technical bulletin of the Department of Entomology, Experi- 

 ment Station, Micliigan Agricultural College. 



