PROCEEDINGS. 373 



Frederick Gntzkow described a new process used iu refiuiiig silver 

 biillion. 



Charles A. Keeler made a few remarks bearing on the question: " What 

 constitutes a species?" 



April 18, 1892.— Stated Meeting. 

 Tne President in the chair. 



Alice Eastwood and William L. Watts were elected resident members. 

 The following communication was read : 



San Francisco, April 18, 1892. 

 Secretary California Academy of Sciences: 



Dear Sir — The proprietors of Zoe have the honor to offer for acceptance 

 of the Academy fifty copies each of volumes i and ii of that journal to be 

 distributed to the principal societies of the world which are in correspond- 

 ence with the Academy, in grateful acknowledgment of favors granted to 

 the California Zoological Club and the California Botanical Club. 

 Eespectftilly, 



H. W. HAEKNESS, 

 T. S. BKANDEGEE, 

 KATHARINE BRANDEGEE. 

 Th6»President then introduced Mr. Edward Muybridge, who delivered 

 a lecture on The Science of Animal Locomotion, with lantern illustration 

 of consecutive phases of animal movements and synthetical reproductions 

 by the zoopraxiscope. 



May 2, 1892. — Stated Meeting. 

 The President in the chair. 



Additions to Library: 



From correspondents 77 



By purchase 107 



By donation 1 



Dr. H. H. Behr read a paper on the Flight of Insects, 



Dr. Harkuess exhibited gall wasps just hatched from leaf-bud galls of 

 the oak. 



The President announced the purchase of the skeleton of a whale, 

 which will be mounted and jjlaced in the gallery of the Museum. 



•2d Ser. Vol. III. ( 27 > 



