•60 PROCEEDINGS OP THE 



Mr. Stone read a paper entitled "Some Light on Night 

 Migration," descriliing graphically a flight of migrants ohserved 

 on the evening of March 27, by the aid of the illumination from 

 a burning lumber-yard in West Philadelphia (see Auk, 1906, 

 p. 249). 



Dr. W. E. Hughes exhibited a number of lantern slides illus- 

 trating the countr}- traversed by him during two hunting-trips 

 to Chihuahua, Mexico, which he had previously described before 

 the Club. 



April 19. 1906. Twenty members present. 



Dr. Spencer Trotter read a paper entitled "The Relationship 

 of the Passeres," which with the aid of charts gave a compre- 

 hensive presentation of the current classification of the Passerine 

 group. An extended discussion followed. 



May S, 1906. Twenty-two members present. 



Dr. Henry Tucker was elected an Associate Member and Mr. 

 R. P. Sharpies a Corresponding Member. 



A paper on "Some Delaware Herons," prepared by Mr. 

 Pennock, was read by Jlr. Stone. A rookery of Great Blue 

 Herons (Ardea herodias) located near Wilmington was described, 

 which contained about twent3'-five occupied nests. 



Mr. Hunt read a paper entitled "The Shifting of a Crow 

 Roost" (see Auk, 1906, p. 429). 



Mr. Morris described a trip to Eaglesmere, Pa., from which 

 he had just returned. He was impressed by the great differ- 

 ence in the advancement of vegetation in the mountains and 

 about Philadelphia as compared with the nearly uniform pro- 

 gress of nest-building at the two localities. 



May 17, 1906. Twenty-one members present. 



Mr. Stone reviewed the work and theories of Hugo De Vries 

 and their bearing upon the evolution of animal species. He con- 

 sidered that " Mutation " if it played any part in evolution veaa 

 not a factor so far as vertebrate animals were concerned. A 

 general discussion followed. 



Mr. Fowler described a recent trip to the lower Susquehanna 

 in the vicinity of York Furnace, Pa. 



