45 



The second paper on "Thistle Hybrids from the Rocky Moun- 

 tains" was by Dr. P. A. Rydberg. The speaker exhibited speci- 

 mens of nineteen supposed hybrids in the genus Carduus, to- 

 gether with their putative parents. The evidences of hybridity 

 were drawn from intermediate morphological characters, sup- 

 ported in most cases by close association in nature with the 

 supposed parents. Descriptions of these Carduus hybrids were 

 published in the Bidletin for November. 

 Adjournment followed. 



Marshall A. Howe, 



Secretary pro tern. 



December 13, 1910 



The meeting was called to order at the American Museum of 

 Natural History at 8:30 p.m. Tuesday, December 13, 1910, 

 with President Rusby in the chair. One hundred people were 

 present. 



After the reading and approval of the minutes of November 30, 

 1910, Dr. W. D. Hoyt, Rutgers College, New Brunswick, N. J., 

 and Miss Jessie P. Rose, Crystal, Oregon, were elected to 

 membership. 



The resignations of Prof. Henry Kraemer, Dr. Raymond H. 

 Pond, and Mrs. L. Schoney were read and accepted. 



The scientific program consisted of an illustrated lecture by 

 Dr. Marshall A. Howe on "A Visit to the Panama Canal Zone." 



The visit described by the speaker occurred in December, 1909, 

 and January, 19 10, and was undertaken under the auspices of 

 the New York Botanical Garden, with the special object of 

 studying and comparing the marine floras of the Atlantic and 

 Pacific oceans, here within less than fifty miles of each other. 



The marine algae proving unexpectedly scarce, especially on 

 the Pacific side of the Isthmus, there was considerable oppor- 

 tunity for taking photographs of general botanical interest and the 

 lantern-slides shown illustrated chiefly some of the more striking 

 features of the land flora of the Canal Zone, such as the numerous 

 native palms, the vegetation of the extensive fresh-water swamps 

 between Colon and Gatun, the swampy forests bordering the 



