PEOCEEDINGS OF THE SOCIETY. 1069 



had been discovered in this conntry where they had only previously found 

 the larva and puj^a. Ho hoped that if any Fellow of the Society should 

 come across this insect, he would make it his duty to bring it forward. 



Mr. Swift exhibited a Microscope which, on the suggestion of Prof. 

 Tuson, of the Royal Veterinary College, had been platinized by a new 

 process of plating by platinum which had been lately introduced, and 

 which, as applied to Microscopes, he considered to be a great advantage. 

 The fittings of stages in particular are much affected by the action of 

 corrosive fluids, but this is entirely obviated by the process in question. 

 The square edges are not rounded off, as is the case where nickelled. 

 The platinizing had been done by the Bright Platinum Plating Company, 

 and, according to the manager, the cost was about that of plating with silver. 



Mr. Croucll exhibited Dr. Woodhead's Microscope with unusually large 

 stage (llf in, by 9f in.) for examining sections through entire organs 

 (supra, p. 1015). 



Mr. G. M. Giles's Army Medical Microscope was exhibited, and his 

 description of it read. The instrument was designed so as to be applicable 

 to all the work of the military surgeon in station as well as in camp life, 

 and at the same time to be so portable as to pack into a box 5 • 8 in. by 

 3-2 in. by 2-75 in. (supra, p. 1012). 



Mr. Crisp said it was not usual in that room to call attention to things 

 which might be sent for the purpose of sale ; but he thought exception 

 might very properly be made in the case of the drawings of the late Mr. 

 Draper. These drawings had, he believed, never been surpassed, and 

 Mr. Draper's widow would be glad to dispose of them to any Fellows of the 

 Society. 



Mr. Beck said he recollected very well these drawings of Mr. Draper, 

 which were certainly the most beautiful he had ever seen. He should, 

 therefore, be glad if by some exercise of their discretion the Council could 

 secure them for the Society. Original drawings had always a special value 

 of their own, and he thought the matter might be referred to the Council to 

 consider whether they could be acquired. In all such cases, where a 

 diligent observer had acquired a power of delineation such as that possessed 

 by Mr. Draper, it was desirable that examples of the results should be in 

 the possession of the Society. He would, therefore, submit to the meeting 

 a motion to the effect that the Council be asked to take the matter into their 

 consideration. 



Mr. Deby seconded the motion, and said that in order to assist in 

 carrying out the suggestion, he would be prepared to subscribe to a fund 

 for the purpose. 



The President having put the motion to the meeting, declared it to be 

 carried unanimously. 



Mr. Deby called attention to the sixth annual report of the United 

 States Geological Survey, dated 1885, but only just distributed, which 

 contains a valuable article by Mr. J. S. Curtis, on the ' Quantitative De- 

 termination of Silver by means of the Microscoj)e.' This method of assay- 

 ing ores of silver is a very considerable improvement upon Plattuer's well- 

 known method, and has really practical applications. A new micrometer 

 measuring apparatus is figured, and the mode of manipulation fully 

 described. 



1887. 4 A 



