Proceedings. xv 



January 20, 1906 4ioth Meeting. 



Vice-President Palmer in the chair and 70 persons present. 



Albert Mann related a case of the capture and raising from 

 the floor of a snake by a spider in Pennington (N. J.) Seminary. 



H. S. Barber noted an attack by the larva of a caryatid beetle 

 upon a ring neck snake. 



T. S. Palmer called attention to the importation of the kea, 

 one of the parrots, into the United States, and of the arrival of 

 ten thousand canaries, the largest single shipment ever received 

 in this country. 



The following communication was presented : 



C. Hart Merriam: Is Mutation a Factor in the Evolution of 

 the Higher Vertebrates?* 



February 3, 1906 4iith Meeting. 



The President in the chair and 65 persons present. 



The President read an invitation to the Society from the St. 

 Louis Academy of Science to participate at a dinner commemo 

 rative of the 50th anniversary of the foundation of the Academy. 



T. Way land Vaughan exhibited a head of coral, Orbicella 

 cavernosa, with an unexplained difference in the size of its polyps. 



The following communications were presented: 



T. Wayland Vaughan : The Work of De Vries and its Im 

 portance in the Study of the Problems of Evolution . 



Gerrit S. Miller, Jr., (read by T. \V. Vaughan): An Instance 

 of Striking Specific Differentiation of Mammals under Uniform 

 Environment. 



February 17, 1906 4izth Meeting. 



Vice-President Palmer in the chair and 32 persons present. 

 The following communications were presented : 

 Paul Bartsch: Variation in the Shell of Goniobasis virginica, 

 with an Outline for Breeding experiments. 



0. F. Cook : The Nature of Evolutionary Motion.! 



* Proc. A. A. A. S., LV, 383, 1906. Science N. S. XXIII, No. 581, 241, Feb. 16, 1906. 

 t Aspects of Kinetic Evolution. Proc. Wash. Acad. Sci., VIII, 197, 1906. 



