t66 MINITTES of Mia-^TINGS. 



tree stump which it was intended to have placed on the lawn 

 of the Institute. Additions to the library and museum were 

 announced. P\)llowing the business portion of the meeting- 

 there took place the usual discussion of current scientific 

 matters. On motion meeting adjourned. 



Jui.v I, 1909. — Regular monthly meeting, with Vice Pre- 

 sident Henry L,. Broomall in the chair. The usual reports of 

 ofhcers were received and current business transacted. The 

 following additions to the library were announced : Reports of 

 the Warren Academy of Science ; United States National 

 Herbarium, Volume 12, Parts 8 and 9: "The Crinoids of 

 Tennessee," Smithsonian National Museum : " Insect Pests 

 of Clover and Alfalfa," Bulletin University ot Illinois: Pro- 

 ceedings Boston Society of Natural History, \'olume 34, 

 Number 7; "New Echinoids from Mississippi," Field 

 Museum of Natural History ; Proceedings United States 

 National Museum, Volume 35 ; "The Microscope," by Car- 

 penter. On behalf of Section A it was announced that T. 

 Chalkley Palmer had discovered a new species of diatom, for 

 which he proposed the name Naviciila socialis. Through the 

 kindness of Dr. Anna E. Broomall a section of wooden water 

 pipe, found while excavating for the cellar of the new Wana- 

 maker building. Thirteenth and Market vStreets, Philadelphia, 

 was presented to the museum. This pipe was laid in 1800 

 and found in igoo. Considering its century underground, 

 the state of preservation was remarkable. In answer to a 

 question, C. M. Broomall explained the theory of single and 

 double rainbows and the accompanying polarization of the 

 light. He also exhibited a specimen of the ghost flower 

 {Monotropa unifJora), which after l^eing placed in alcohol had 

 turned black. The coloring matter of the flower gave a strong 

 purple solution in alcohol. Miss Amy Markley presented to 

 the Institute an old copper plate, with a ]irint made from it, 

 both found in the Emlen house (built 1794, at Yearsley's Mill ) 

 when Samuel .Markley bought and took possession of the place. 



