156 PROCEEDINGS OF THE ACADEMY OF [May, 



May 21. 

 Charles Morris in the Chair. 



Nineteen persons present. 



The meeting was held in conjunction with the Mineralogical and 

 Geological Section. 



The reception of the following papers was reported by the Publi- 

 cation Committee: 



"Further Experiments with Mutations in Eye-color of Drosophila: 

 The Loss of the Orange Factor," by T. H. Morgan (April 23). 



"Some Aboriginal Sites on Red River," by Clarence B. Moore 

 (April 29). 



"On the Radiation of Energy," by James E. Ives (May 9). 



"The Gorgonians of the Brazilian Coast," by A. E. Verrill 

 (May 10). 



"Tetraplasy, the Law of the Four Inseparable Factors of Evolu- 

 tion," by Henry Fairfield Osborn (May 18). 



"Apparent Sun-crack Structures and Ringing-rock Phenomena in 

 the Triassic Diabase of Eastern Pennsvlvania," by Edgar T. Wherrv 

 (May 20). 



"Lynmaea, Columella, and Self-fertilization," by Harold Sellers 

 Colton (May 21). 



The Triassic of Pennsylvania. — Dr. Edgar T. Wherry spoke of 

 the discovery of silicified wood, first described from Bucks County 

 at a meeting three years ago, at a number of new localities as far 

 west as Lancaster and York Counties. He also described observa- 

 tions along the north border of the area, where hills underlain by a 

 coarse conglomerate are believed to represent delta deposits of rivers 

 flowing from the north into the Triassic basin, although the large 

 size and distant source of many of the pebbles suggests the possible 

 activity of floating ice as a means of transportation. He further 

 discussed certain phenomena connected with the diabase of the 

 region, especially the formation of boulders and hexagonally arranged 

 crack structures.' 



Dr. F. Bascom made a communication on the lavas of South 

 Mountain, Pennsylvania. (No abstract.) 



The following were ordered to be published: 



