PROCEEDINGS OF THE SOCIETY. 735 



Mr. Groves thought the idea was very good; but it was not 

 new, except perhaps in its application to the examination of test-tubes, 

 In examining capillary tubes it had long been used, but glycerin was 

 usually employed in place of alcohol. 



Mr. Cheshire said he was not at first aware that glycerin had been 

 used for the purpose, but he thought alcohol much better, as it mixed 

 more freely with the water without producing any cloudy effect, and 

 it dried off at once without any necessity for cleansing the tubes out- 

 side after using. 



The President said they were always glad to have evidence of 

 practical work brought before them, and no doubt the utility of this 

 device would be readily apparent to all. 



Prof. Bell, at the request of the President, gave an account of 

 what he regarded as the most extraordinary biological fact brought 

 to light during the last twenty-five years, that of a third eye at the 

 top of the head of certain lizards (supra, p. 580). 



The President said he was sure that all present must feel much 

 obliged to Prof. Bell for the very clear manner in which he had 

 described the features of this remarkable organ. For his own part 

 he could only say that when he came to the meeting the facts were, 

 so to speak, more or less in a cloud, but the lucid explanation of 

 Prof. Bell had enabled him to see them in a clear light and to follow 

 the conclusions to which they seemed to point. 



Mr. Crisp called attention to a new lamp for the Microscope which 

 had been sent for exhibition by Mr. Curties, and which was so cheap 

 and simple that it seemed likely to become the lamp of the future. 

 It was founded on the lamp originally devised by Mr. Nelson 

 (supra, p. 688). 



M. A. Brachet's communication suggesting the use of a hyper- 

 bolic lens for the field lens of the eye-piece was read. M. Brachet 

 claimed that thereby the diaphragms in the eye-piece and objective 

 could be dispensed with and the image much improved. 



Dr. Crookshank read a paper on Photo-micrography, which was 

 illustrated by the exhibition of a large number of prints, negatives, 

 &c. 



Mr. Glaisher said he had examined Dr. Crookshank's exhibits, 

 and thought they were certainly very beautiful productions. He had 

 for many years taken a great interest in the subject of photography, 

 and had looked to it with hopes which had been more nearly fulfilled 

 than ever before by the specimens before them. He had heard the 

 paper with great pleasure, and could only express his admiration 

 of it, believing as he did that it held out great promise for the 

 future. 



