333 



Mr. T. Spencer, proposed by Mr. T. C. White and seconded by Dr. Matthews. 

 Mr. Chas. Stewart, „ Dr. Matthews ,, Mr. T.C White. 



It being necessary that the accounts of the Society should be duly audited 

 before the next meeting, Mr. Hainworth was appointed Auditor on behalf 

 of the Committee ; and Mr. Dobson having been proposed by Mr. Moginie, 

 and seconded by Mr. Hind, was unanimously elected Auditor on behalf of 

 the members. 



The Secretary read a letter which had been received from Mr. Fnllagar, 

 stating that having found some curious bodies amongst the debris of some 

 sponges, which he was unable to identify, he had sent some specimens to 

 the Club, in the hope that some of the members might be able to recognise 

 them. The objects would be exhibited under a microscope at the close of 

 the meeting. 



Mr. J. E. Ingpen then communicated to the meeting " Some Notes on the 

 Camera Lucida." Commencing by illustrating the general principles of the 

 instrument, as applied to landscape-drawing, and describing the forms in- 

 vented by Wollaston, Amici and others for that purpose, he proceeded to 

 explain the use of the camera in conjunction with the microscope, and de- 

 scribed various forms, both of prismatic and reflecting cameras, the principal 

 being those of Wollaston, Amici, Soemmering, Chevalier, Doyere, Nobert, 

 Beale and Nachet, the latter having special reference to the use of the 

 microscope in vertical and inclined positions. The use of the reticulated 

 micrometer was also referred to, and tome concluding remarks made upon 

 the value of camera lucida drawings for speed and accuracy, and as 

 forming a check upon fanciful delineations of microscopical objects.* The 

 description was illustrated by numerous diagrams, and specimens of most of 

 the forms were also exhibited. 



Mr. T. C. White regarded the subject as one of immense importance, and 

 thought it could hardly be overrated. He quite agreed with Mr. Ingpen as 

 to the use of the camera lucida as a check on the fancy in drawing micro- 

 scopic objects, but many difficulties arose in practice, because these con- 

 trivances all required the instrument to be inclined, and what was so often 

 wanted was something which would enable an object to be drawn whilst 

 the body of the microscope was in a vertical position. He had tried the 

 neutral tint reflector, and found it very well in its way, but he had also 

 adopted a still more simple method, consisting simply of a little piece of 

 thin covering glass, set at an angle of 45° above the eyepiece ; this he 

 found to answer very well, and he had for many years. made sketches with 

 it. But when wanting to make drawings of marine life, of course if the 

 stage were inclined, all the things would run off at once. It was of 

 great importance to be able to draw a striking object at any moment 

 without disturbing it at all, and what he had seen of the new forms led him 

 to believe that some of them would answer the purpose j he had therefore 



* For particulars respecting the Reticulated Micrometer (suggested by Francis Baner, 

 F.R.S.) see Appendix to Goring and Pritchard's " Micrographia" p. 221. For various forms 

 of Camera Lucida see " Quekett on the Microscope " Ed. 1853, p. 167-8, 253-4 ; "Carpenter 

 on the Microscope," 5th Ed., 1875, p. 127 et seg ; "Quart. Journ. Mic Sc , Vol. viii. (I860;, 

 p. 156. 



