1890.] MICKOSCOPICAL JOtJENAL. 81 



which these directions for the use of the Hsemometer will probably 

 have upon the most of my readers, but that I will also find this im- 

 pression well founded by the evident incongruity between the small 

 number, the simple character, and the rapid execution of the proceed- 

 ings demanded in Haemometer measuring on the one hand and on the 

 other, great number of rules and instructions which I have given above. 

 Since all should be alive to the importance of the cautionary rules for 

 the correct execution of these proceedings, it cannot be otherwise than 

 that every one wnll find in these instructions much that he already 

 knows or considers self-evident, but it may also be that each will find 

 something new or something which he himself would not have arrived 

 at. The purpose in giving at length these rules is to enable each possessor 

 of a Hajmometer to use it without fruitless attempts. In the very be- 

 ginning he should make useful and reliable measurements. The pur- 

 pose could be fully carried out only by a complete enumeration of all 

 possible rules that might be considered. 



Detroit Meeting of the American Society of Microscopists. 



By G. E. fell, M. D., 



BUFFALO, N. Y. " 



Owing to the terrible calamity at Louisville where the meeting was 

 to have been held, and at the request of the Louisville Microscopical 

 Club, a change in location of meeting is made, and a cordial invitation 

 of the Detroit microscopists has been accepted. The next meeting of 

 the Society will, therefore, be held at Detroit, Mich., beginning August 

 13, 1890, and lasting four days. The sessions will be taken up, to a 

 great extent, with the reading and discussion of papers. Special feat- 

 ures of each meeting are the President's Address, the Working Session, 

 and the Microscopical Exhibition. The manufacturers' exhibit of ap- 

 paratus, slides, etc., is generally very extensive. 



This Society was organized at Indianapolis, Ind., in 1879, and is now 

 in its second decade. Successful meetings have been held at Buffalo, 

 Detroit, Columbus, Elmira, Chicago, Rochester, Cleveland, Chautau- 

 qua, Pittsburgh, Columbus, and Buffalo, in the order given. 



Each year a volume of proceedings, furnished free to the members, 

 and consisting of from one to four hundred pages, has been issued. 

 Some most valuable contributions have appeared in these volumes. 

 Among these may be mentioned the record of the life-work of Chas. A. 

 Spencer, Robert B. Tolles, names inseparably connected with the ad- 

 vance of microscopy ; the memoir of Prof. Hamilton L. Smith on the 

 Diatomaceae ; of Prof. Wm. A. Rogers on Micrometry, and many 

 others. Most every branch of microscopical investigation has been re- 

 ported in the pages of the proceedings. The results of the past ten 

 years has demonstrated the great value and need of the Society in up- 

 holding and placing on record the work of American microscopists. 

 To non-attendant members the proceedings will give a full account of 

 the meeting, and should be a sufficient inducement to add greatly to the 

 membership. 



The advantages of attendance, as may readily be seen, are very great. 

 Usually a good percentage of the members attend. 



