174 THE AMERICAN MONTHLY [July, 



Hayes, one of its oldest and most esteemed members, and father 

 of Ply m S. Hayes, former president of the society. 



Dr. Justin Hayes' membership extended previously to the 

 great fire of 187 1. He was always an active and zealous mem- 

 ber, doing all possible to assist the society and cause of micros- 

 copy. He was of special service in assisting the society in 

 entertaining the American Microscopical Society some years 

 since. 



He was regular in attendance upon meetings until the infirmi- 

 ties of years compelled him to desist, and his wise counsel and 

 assistance were always highly esteemed. 



While not himself an expert microscopist, he always desired 

 the best knowledge of the science, and was interested in its pro- 

 motion to the verv last. 



MICROSC OPICAL NEWS. 



Leidy's Microscopes. — Those familiar with the life-work of 

 the late Dr. Joseph Leidy will be interested to know that the two 

 microscopes which he used for years and from which he obtained 

 such valuable results are now for sale. They were bought in 

 187^, and were in almost constant use down to the date of his 

 death. They show how careful a student he was, in that they are 

 in perfect order and very little soiled or scratched. The outfit 

 consists of one Beck Popular Binocular Stand, complete; two 

 pair eye-pieces ; substage condenser ; polariscope ; liberkuhne ; 

 VVenhan's Parabolic Reflector ; ^^-inch olijective ; stage forceps 

 and plain forceps ; one Beck National Stand, monocular, com- 

 plete, with movable top stage ; bull's-eye condenser on stand 

 with universal movement; two eye-pieces ; ^inch objective (best 

 series) ; yL-inch immersion objective ; camera lucida ; polari- 

 scope. 



Mrs. Jos. Leidy has placed the articles in the hands of Messrs. 

 Williams, Browne & Darle, Philadelphia, who will be pleased to 

 show them to any one desiring to see them. 



H. L. Tolman sails for Europe, July 6th, on the Teutonic 

 to visit the microscope manufacturers, such as Powell & Lealand, 

 Crouch, Zeiss, Reichert, Leitz, Watson & Nachet, as the repre- 

 sentative of the World's Columbian Exhibition. He hopes to 

 secure exhibits from the most of them. He will conti-ibute ar- 

 ticles to our columns relative to what he sees of interest to microsco- 

 pists. 



The Key to Algae and Desmids which was projected 

 some months ago and advertised conditionally upon a sufficient 

 number of subscriptions being obtained has been abandoned as 

 impracticable at the present time. 



Prize.— The publisher of the International Journal of 



