MINUTES OF aECTIOX A. 



May 13, 1909. — Lewis Kirk, with blackboard illustration, 

 explained the XLVII Proposition of Euclid ; also interesting 

 facts concerning hexagons. T. Chalkier Palmer exhibited 

 some diatoms taken from a spring water trough on a road 

 near Dismal Run. These diatoms were amongst the smallest 

 of naviculoid forms, measuring not more than from 6fj. to 7^/x 

 in length. Albert S. Barker exhibited Baty-achosperinum mon- 

 iliforme, in fruit, also the antheridia of a moss, with the 

 antherozoids fulh' developed and active. A letter from Dr. 

 John Marshall to Dr. Reichel, on the reaction between potas- 

 sium permanganate and formaldehyde, was read to the Sec- 

 tion. This subject had been presented by C. M. Broomall. 

 The effects of varied chemical treatment upon the colors of 

 flowers was the subject of remarks by C. M. Broomall, who 

 gave the results of numerous experiments. 



May 20, 1909. — E. \'. Streeper, Jr., submitted for deter- 

 mination a worm taken from Philadelphia tap water. Charles 

 Potts spoke on the mode of locomotion of the grub worm. 

 Dr. B. M. Underbill presented a specimen of Hypoderma lin- 

 eata, commonly known as the ox warble, in the larval stage. 

 Albert S. Barker exhibited, under the microscope, living spe- 

 cimens of Hydia vii-idis \ also mounted slide of Hydra i^iil- 

 o^aris, showing the thread cells. Miss Pennell exhibited snake 

 skins and palmetto fibre from Florida. Charles Potts, speak- 

 ing of eels, stated that when a boy he found, in an under- 

 ground passage below Fairmount Dam, Philadelphia, a great 

 number of eels about two inches in length, clinging to the 

 walls. Sanford Omensetter presented two living specimens of 

 the common garter snake. 



May 27, 1909. — Dr. David Dalton, of Sharon Hill, exhi- 

 bited slides of human blood under both normal and abnormal 

 conditions ; also slides of the bacilli of tuberculosis, typhoid 

 fever, vellow fever, anthrax, and others: also, a cross section 



