172 MINUTES OF SECTION A. 



of the Sphex insect. C. M. Brooiiiall discoursed on the bac- 

 terioloejical condition of Media water since recent rains. 

 Albert S. Barker explained the model of a star finder. 



Junk 29, 191 1. — Address, "Orthographic Elision," by 

 Henr>' L. Brooniall. 



July 13, 1911. — C. Kdgar Ogden exhibited a tarantula 

 and its nest. Dr. Trimble Pratt showed beach specimens 

 {Sertularia and others) from Nantucket Island. 



July 20, 191 1. — C. M. Broomall explained by diagram 

 the tendency of the top to rise. Albert S. Barker exhibited 

 under the microscope a Tubularian from Bermuda. 



July 27, 191 1. — T. Chalkley Palmer illustrated the prin- 

 ciple of floral atavism by means of specimens of Rudhcckia 

 hirta and Daiicus carota. A bunch of the former showed 

 green bracts instead of yellow petals. Mr. Palmer also exhi- 

 bited a specimen of hermit crab from Port de Paix, Hayti. 

 C. M. Broomall reported progress in bacteriological determin- 

 ations, and Alice Haviland gave an account of the actions 

 of Microhydra. 



