RECORDS OF MEETINGS OF 1906 293 



color, unknown to any birds of this species in a wild state. Other experi- 

 ments showed that food and light were not factors in causing the changes, 

 which were apparently due therefore solely to changes in humidity. 



The Section then had the pleasure of listening to an interesting address 

 by Sir William Henry Perkin, the discoverer of the color mauve, who spoke 

 of the great advances made in the knowledge of natural colors, such as 

 indigo, etc., in the last fifty years. The development of our knowledge of 

 the coal-tar products, to which even the coloring matter in plants is nearly 

 all related, has been especially important. 



Professor Crampton then spoke of the progress of the work at Cold 

 Spring Harbor, the Carnegie Laboratory and Woods Holl, and gave a 

 brief account of the progress made in his experiments on inheritance in the 

 C}'nthia moth, and of his studies on variation in connection with the land- 

 snail, Partula, in Taluti. 



The meeting then adjourned. 



Roy W. Miner, 

 Secretary pro tern. 



SECTION OF GEOLOGY AND MINERALOGY. 

 October 8, 1906. 



The Section met at 8:15 P. M., at the American Museum of Natural 

 Histor}', Mr. Alfred W. Tuttle presiding. 



The minutes of the preceding meeting of the Section were read and 

 approved. 



A communication from Dr. Kunz, relative to the death of the following 

 members was read by Mr. Miner: 



Professor Samuel L. Penfield of Yale, 

 Professor I. C. Russell of Michigan University, 

 Dr. Henry A. Ward of Chicago. 



On motion of Professor A. W. Grabau the following committee was 

 appointed to draw up resolutions to be presented at the annual Meeting: 



Dr. George F. Kunz, 

 Professor J. F. Kemp, 

 Dr. E. O. Hovey. 



The following program was then presented: 



