PROCEEDINGS; 



NINETIETH MEETING, February 20, 1886. 



The President in the chair, and thirty-seven persons present. 



Dr. D. E. Salmon and Dr. Theobald Smith presented a pa 

 per, which was read by the latter, entitled, ON A NEW METHOD 

 OF PRODUCING IMMUNITY FROM CONTAGIOUS DISEASES. 



A paper by Prof. C. V. Riley, describing A CARNIVOROUS 

 BUTTERFLY LARVA, FENESICA TARQUINIUS,! was read by Mr. 

 J. B. Smith. Specimens of both the larva and imago were ex 

 hibited. 



Prof. L. F. Ward spoke upon THE PLANE TREE AND ITS AN 

 CESTORS,! and exhibited specimens and figures of both the recent 

 and fossil species. 



Dr. C. Hart Merriam described A NEW SPECIES OF APLODON- 

 TIA FROM CALIFORNIA, and exhibited skins and skulls of the 

 only two species of the genus at present known. 



NINETY-FIRST MEETING, March 6, 1886. 



The President in the chair, and thirty-six persons present. 



Dr. George Vasey spoke upon NEW AND RECENT SPECIES OF 

 NORTH AMERICAN GRASSES. 



Mr. Charles Hallock read a paper entitled HYPER-!NSTINCT 

 IN ANIMALS. 



* Until March 19, 1887, the meetings were held either in the Lecture 

 Room or in the office of the National Museum, and subsequently in the 

 Assembly Hall of the Cosmos Club, on Lafayette Square. 



1 1886. Amer. Nat., June; and Proc. Ent. Soc., Washington, i, No. 2, 



P-37- 



I The Paleontological History of the Genus Platanus. <Proc. U. S. 

 Nat. Mus., xi. (In cource of publication.) 



1886. MERRIAM, C. HART. Description of a Ne-w Species of Aplo- 

 dontia from California. < Ann. N. Y. Acad. Sci., iii, No. 10, pp. 312-328, 

 plates 19, 20, and two tables. 



VII 



