RECORDS. 191 



Summary of Papers. 



Professor Harold Jacoby and Dr. S. Alfred Mitchell exhib- 

 ited a combined prismatic transit and zenith telescope. This 

 instrument, just received by the Department of Astronomy of 

 Columbia University, was made by Bamberg, of Berlin. It in- 

 cludes all the latest observational devices, including an eye-piece 

 of the Repsold pattern for the automatic registration of transit 

 observations. 



Dr. George F. Kunz and Dr. Charles Baskerville gave an 

 exhibition of radium of 300,000 activity, with some notes on the 

 action of the Rontgen ray, ultra-violet light and radium on 

 mineralogical substances. This paper has been published in 

 Science^ N. S., Vol. XVIII, 1903, pp. 769-783. 



S. A. Mitchell, 

 Secretary of Section. 



SECTION OF BIOLOGY. 

 October 12, 1903. 



The first meeting of the academic year was held at the Ameri- 

 can Museum of Natural History on October 12, Professor 

 Wilson acting as temporary chairman. As in former years, this 

 first meeting after the long vacation was devoted to reports on 

 scientific work carried on by members of the Section during the 

 summer. The following notes indicate the lines of the work of 

 the members who reported. 



Professor Bristol in association with Professor Mark, of 

 Harvard, directed the summer work of the Bermuda Biological 

 Station Dr. Hay was very successful in collecting in Wyo- 

 ming materials for his studies of fossil turtles. Professor Os- 

 born directed explorations in Wyoming, Nebraska and South 

 Dakota in the interest of the American Museum of Natural 

 History, securing much valuable material which supplements 

 collections previously made. Professor Grabau collected in 

 Michigan materials for continuation of his studies on Devonian 

 faunas. Dr. Summer directed the Biological Laboratory of the 



