1884.] 



MICROSCOPICAL JOURNAL. 



171 



done here than I have hitherto real- 

 ized. Anything I can do to further 

 your interest I shall do with the 

 greatest pleasure.' 



Professor W^illiam A. Rogers read 

 a paper on a ' New Form of Section 

 Cutter.' The two features of a sec- 

 tion cutter in which the speaker 

 thought improvement could be made 

 were : First. A method of moving 

 the plate to which the section to be 

 cut was attached over a definite and 

 a known distance. Second. A 

 method of firmly holding the plate in 

 position during the operation of cut- 

 ting the section. The speaker said it 

 was proposed to move the plate be- 

 tween two vertical walls as guides 

 over the distance required as indica- 

 ted bv a graduated scale attached to 

 the plate and in the focal plane of an 

 objective attached to the frame upon 

 which it moved. The movement of 

 the plate might be made either by a 

 screw or by tapping with a small 

 hammer. In order to hold the plate 

 firmlv in position after the movement 

 had been made under the microscope 

 the plate rested upon the poles of four 

 magnets, which projected through 

 the frame from beneath. When the 

 circuit was completed the plate suf- 

 fered no disturbance, since it rested 

 directly upon the cores of the mag- 

 nets. Disturbance was only pro- 

 duced when there was motion. Here 

 no motion could take place. More- 

 over, the observer, by an examina- 

 tion of the graduated scale while the 

 circuit was being completed, could 

 be sure that the operation of clamp- 

 ing had produced no disturbance in 

 position. Professor Rogers illustra- 

 ted his plan by diagrams on the black- 

 board. 



Mr. H. F. Atwood announced that 

 tickets for the soiree at the arsenal 

 this evening could be procured of 

 Secretary Kellicott. He said that 

 already 2,000 tickets had been issued. 

 There were to be 125 microscopes in 

 the exhibition. 



Mr. E. H. Griffith described a 

 working cabinet which he had de- 



signed. He exhibited the cabinet, 

 which contained places for all the 

 apparatus connected with the micro- 

 scope. He also exhibited and de- 

 scribed improved turn-tables and 

 nose-pieces which he had invented. 



Dr. Blackham, of the memorial 

 committee, read the following report : 



'Your committee would respect- 

 fully report that in their opinion this 

 Society should express its willingness 

 to receive and care for any moneys 

 which may from time to time be vol- 

 untarily contributed for the purpose 

 of perpetuating by suitable memorials 

 the memory of the late distinguished 

 opticians, our late honorary mem- 

 bers, Charles A. Spencer and Robert 

 B. Tolles, and we therefore ofler the 

 following resolution : — 



' Resolved^ That the treasurer be 

 directed to open two accounts with 

 the Charles A. Spencer memorial 

 fund and the Robert B. Tolles me- 

 morial fund, and credit to each all 

 moneys contributed for that purpose, 

 and invest them securely till such 

 time as an amovmt may be accumu- 

 lated which this Society shall deem 

 sufficient to pay for suitable memo- 

 rials, and shall report at each annual 

 meeting of this Society the state of 

 each ot said funds.' 



The resolution was adopted, after 

 which the Society adjourned. 



In the evening the members of the 

 Society, accompanied by many of 

 their friends, visited the manufactory 

 of Bausch & Lomb. The grounds 

 were brilMantly illuminated. All the 

 departmei ts of the manufactory were 

 in operation, and the visitors made a 

 thorough inspection under the guid- 

 ance of several employes, who ex- 

 plained all the processes. Later the 

 visitors assembled in a large tent on 

 the grounds, where an elaborate sup- 

 per was provided. 



The proceedings of the third day 

 were opened by a long paper by Dr. 

 Geo. E. Fell on some ' expert testi- 

 mony in a forgery case,' mainly de- 

 voted to the detection of different inks 

 in a document by their color. 



