214 PROGRAMS AND ANNOUNCEMENTS 



specimens rarely show stolons and many other habit features that are 

 conspicuous and characteristic in the field. Paspalum mucronatum, 

 common in Gatun Lake, produces long stolons that creep upon the sur- 

 face of the water, being floated by means of inflated sheaths. 



There is evidently considerable periodicity in the flowering time of 

 grasses in Panama even in localities when the rainfall is fairly well dis- 

 tributed throughout the year. Paspalum saccharoides and P. fascicula- 

 tum mentioned previously were in full flower during September but in 

 December not an inflorescence could be seen. On the other hand, Pani- 

 cum barbinode, flowerless during the fall, was in full flower in December, 

 while many species frequently observed in flower in Central America were 

 in December just beginning to flower in the savannas of Panama, as for 

 example, Andropogon fastigiatus and A. brevifolius. 



There were collected in Panama 584 numbers, together with a large 

 number of duplicates. These numbers probably represent about 200 

 species. It is interesting to note that Nees von Esenbeck lists in See- 

 man's Flora of Panama, 27 species of grasses. 



This communication was profusely illustrated by lantern views. 



D. E. Lantz, Recording Secretary. 



PROGRAMS AND ANNOUNCEMENTS 



THE PHILOSOPHICAL SOCIETY OF WASHINGTON 



The 709th meeting will be held at the Cosmos Club, Saturday evening, 

 April 20, 1912, when Mr. Alexander Macfarlane will give (by invi- 

 tation) an Account of Researches in the Algebra of Physics. 



THE CHEMICAL SOCIETY 



The Centennial of the Gas industry will be' commemorated by a 

 meeting on Wednesday May 1, 1912, at the Institute of Industrial 

 Research. 



