MINUTES OF SECTION A. 



November 17, 1910. — C. M. Broomall exhibited cultures 

 of bacteria from Ridley creek, Broomall 's dam and the Asy- 

 lum run, together with the comparative generation of gas in 

 fermentation tubes in samples from the above localities. Also 

 a specimen of " peacock coal " found in the Institute supply. 

 Albert S. Barker drew attention to the cup shaped termination 

 to the pedicle which on the leaves of the poplar enclosed the 

 bud for the succeeding Spring. He also with crystallized cal- 

 cite showed double refraction and on the blackboard gave a 

 clear exposition of the polarization of light. 



December 15, igio. — T. Chalkley Palmer spoke on meth- 

 ods of staining Stirhrlla, and C. Edgar Ogden on geological 

 characteristics of eastern Pennsylvania and New Jersey. 



December 29, 1910. — C. M. Broomall illustrated and 

 spoke upon his experiments with bacterial culture, and 

 explained the method of the separation of silica and clay by 

 means of green soap. C. Edgar Ogden showed under the 

 microscope a fine collection of diatoms and desmids. Henry 

 L. Broomall spoke on "The Verb." 



January 19, 191 1. — C. M. Broomall made some remarks 

 upon an article on the pressure of wind on weather vanes, in 

 which it was claimed the pressure was greater when the wind 

 struck the vane at an angle. He also explained the theory 

 of the fountain ball. Henr}'- L,. Broomall spoke on the Ainos 

 of Japan, and illustrated the difference between an inflected 

 and an agglutinative language. 



January 26, 1911. — In relation the preservation of micro- 

 scopical slides, John W. Palmer exhibited a specimen of 

 Volvox which had remained in good condition for fifteen years. 



