xiv Proceedings of the Biological Society of Washington. 



The regular program was a symposium on ' ' Recently Intro- 

 duced Pests and the Problem of Accidental Introduction," and 

 consisted of four communications as follows : 



The Pink Bollworm of Cotton ; C. L. Marlatt. 



Recently Introduced Fruit Insects ; A. L. Quaintance. 



Some Biological Aspects of the Spread of the White Pine 

 Blister Rust; Perley Spaulding. 



Some Points for Consideration in a Discussion of the Problem 

 of Accidental Introductions ; L. 0. Howard. 



December 1, 1917— 575th Meeting.* 



President Hay in the chair, 26 persons present. 



Dr. Walter P. Taylor exhibited and discussed the distribution 

 of marmots from the State of Washington. 



Alexander Wetmore discussed the peculiar molting in ducks. 



Dr. T. S. Palmer called attention to the recent successful 

 meeting of the A. O. U. 



Dr. L. 0. Howard called attention to a recent article in a 

 French scientific journal giving analysis of bread found on a 

 captured Zeppelin, as compared with that taken from German 

 prisoners. 



W. P. Hay exhibited lantern slides of the marine turtles of 

 eastern North America and gave an account of their habits, 

 distinctive characters, and uses to man. 



Alexander Wetmore remarked on red bats seen November 

 17, 1917. 



The regular program consisted of two communications as 

 follows : 



Haak as Author of Brisson's 1762 Edition of Regnum Ani- 

 male ; Charles Wardell Stiles ; (Paper presented by Dr. T. S. 

 Palmer, under the title The Author of Brisson's 1762 Edition 

 of Regnum Animale, in the absence of Dr. Stiles, who was called 

 away on war service) . 



The Relative Resistance of the Red Blood Corpuscles of the 

 Sheep, Ox and Hog; Lieut. M. W. Lyon, Jr.t 



* Abstracts in Journ. Washington Acad. Sci., vol. 8, pp. 41, 42, January 19, 1918. 

 + Published in Journ. Infectious Dis., vol. — , pp. , January, 1918. 



