46 SECTION MINUTES. 



tude " on the earth. Albert S. Barker exhibited various 

 interesting microscopic specimens, including the sting of the 

 Sphex insect. 



October 21, 1909. — T. Chalkley Palmer, speaking of 

 diatoms, mentioned Bacillaria paradoxa, a species first 

 described in 1780, describing its peculiar method of motion. 

 C. E. Ogden exhibited a large collection of Volvox collected 

 near Strathaven Inn, Swarthmore. John W. Palmer exhi- 

 bited specimens of the same organism collected about 15 years 

 ago, which were still in good condition. Albert S. Barker 

 exhibited a specimen of Nitella, of the Order Caraccea, com- 

 monly known as the stone wort, especially noted for the 

 strong movement of protoplasm in its internodes. 



