300 Proceedings. 



Professor H. L. Osborn read a paper entitled : Class instruc- 

 tion in Crustacean Morphology. 



[abstract,] 



The Crustacea are an especially favorable group for class instruction, in 

 the principles of animal morphology : 



1. Because it presents a wide range of subgroups, each one very large 

 and with wide divergence of form, e. g. Copepoda, Ostracoda, Cirripedia. 

 Amphipoda, Isopoda and macroura and brachyoura. 



2. Because of the extensive larvae life of many of the forms, e. g. 

 Peneus, Schizopoda, etc. 



3. Because the important structural characters are drawn from parts 

 extremely favorable for fossilization — viz: the outer shell. 



4. Because the members of the group are some of them of sufficiently 

 large size and anatomical simplicity to permit of their being studied by 

 beginners. 



5. Because of great range of physiological habit in closely allied 

 forms, parasitism and free swimming life and commensalism. Also the 

 spiral symmetry e. g. of hermit crab, and many other cases. 



A series of minerals and ores was presented to the Academy, 

 by Dr. A. F. Elliot, for which a vote of thanks was tendered. 

 Museum numbers (778-784). 



A series of specimens of typical minerals was presented by 

 the United States National Museum. The thanks of the Academy 

 were extended for this fine gift. Museum numbers (721-777). 



A comunication from Mr. J. C. Slafter, proposing to deposit 

 certain specimens in the Museum, was referred to the president 

 and secretary. 



Dr. Thomas S. Roberts reported the king rail from the vicin- 

 ity of Mineapolis. This bird is rare further north than Illinois, 

 having been seen in Minnesota only three times before ; at Minne- 

 apolis in 1880; once in Kandiyohi county; and at Winona in 1886. 



Franklin Benner and Dr. Hatch both contributed ornitholog- 

 ical notes. 



June 1 O. I 890. 



Thirty-five persons were present. 



Louis F. Menage, John H. Cook and W. M. Dodge were 

 elected members. 



The regular program was the report of the section of Geol- 

 ogy- 



C. W. Hall read a paper on Artesian and Deep wells as a 

 source of water supply in the Northwestern States. 



