Proceed if)(/s. 1 1 



C. L. llerrick, from the section of biology. rea<l ;i paper whicii 

 dealt particularly with Mo}iospiJits, a genus of Oladoceran Crus- 

 tacea, new to America, and peculiar aniono^ its rehitives in the 

 absence of the compound eye, the larval organ ])eing persistent 

 through life, a fact supposed to be due to retrograde development. 



Wiirren Upham, in introducing the programme of the section 

 of botany for the evening, spoke of the progress niade in cata- 

 loguing the flowering plants and ferns of Minnesota and expressed 

 the hope that the geological and natural history survey would 

 i-sue such a catalogue in the course of the coming year. 



• Dr. W. E. Leonard then read a paper on the condition of the 

 Academy's herbarium, and outlined plans ah'eady set on foot for 

 making it as complete as possible for the whole state. Miss 

 Manning, of Lake City, and a clergyman of Saint Paul, among 

 others, had been secured to make collections. 



Mr. John B. Leiberg contributed ''Notes on the flora of Mon^ 

 tana and Dakota." This paper was read by Mr. Ifphani. 



[See paper H. J 



Mr. Upham also contributed some interesting facts touching 

 "The Common Weeds of Minnesota." One thing stated was that 

 only about one-half as many introduced plants were growing in 

 Minnesota as in New^ England, owing no doubt to the more recent 

 settlement of the former section. 



Aprils, 1884. 



Thirteen persons present. 



The following presentations were made: 



By President Elliot : Leaf irapression«, Little Missouri, several; baked 

 earth with tufa, same locality; fossil fern leaves, Morris Co , 111.; 5 speci- 

 mens; crystals of antimony sulphide (Stibnite,) Prince William, X. B. ; 

 and the three following from Iron Butte, Mont.: inocernmua p'-ohJemdticus, 

 amrnoniteH npf: hacuUtes, probably Ovatvs. Several other specimens not 

 named, Vvere received from Col. J. "B, Clougli, localities in Dakota and 

 Montana. 



The paper of the evening \va^ read by Professor J. A. Dodge 

 entitled "An Analysis of Filtered Water." 



[See paper I ] 



In the discussion which followed, C. W. Hall called attention 

 to some of the physical features of the u]iper Mississippi valley. 

 He said : 



The area of the Mississippi river valley above the mouth of the Minnesota 

 river at Fort Snelling is, jiccording to a careful computation, 16,500 square 



