1122 PROCEEDINGS OF THE SOCIETY. 



and lie was told that this would maintain a light efficiently for ten or 

 twelve hours consecutively. He had seen the working of the Trouve 

 lamp at Antwerp, when it was successfully used by Dr. Van Heurck, 

 who made a number of difficult observations with it. He used it with 

 some care, only employing a very little battery-power to begin with ; 

 but the light was so perfectly under command, especially for purposes 

 of oblique illumination, that he certainly saw some of the most 

 brilliant effects produced by it. He thought a more powerful battery 

 than Trouve's was needed. Dr. Van Heurck had a dynamo in his 

 house, and could therefore employ incandescent lamps of any 

 desirable power, and with such advantages he had certainly shown 

 him (Mr. Mayall) the strongest and finest resolution that he had 

 ever seen by artificial light. 



Mr. Michael said that the practical difficulty in the use of electric 

 lamps of this kind was not only as to the quantity of light obtainable, 

 but also as to its quality ; because it was only when burnt at its 

 full strength that they got a white light ; at other times it was either 

 red or yellow, if any means could be devised by which they could 

 get even a very small point of constant bright light it would be very 

 much better ; under present circumstances, if they reduced the quantity 

 of the current, they at once reduced the quality of the light. 



The President said he quite agreed with Mr. Michael in his 

 remarks as to the desirability of getting a constant quality of light 

 as well as a sufficient quantity. He could see that the advantage of 

 a lamp like this was the exceeding ease with which it could be applied 

 to any point they wished, and he had long felt that if anything of 

 this kind could be well and easily applied, it would be a very efficient 

 aid to research. 



Dr. Matthews believed that in point of economy it would be very 

 much better to obtain more or less light by immersing the whole of 

 the plates more or less in the liquid than to immerse the whole 

 of them and then only to use one or two at a time, because the others 

 would meanwhile only be wasting by chemical action. 



Mr. J. W. Grroves exhibited a very large microtome, made under 

 the directions of Mr. J. W. Barrett, M.B., for the purpose of cutting 

 sections of large substances. One particular advantage was that both 

 the razor and the object were immersed in spirit, so that the sections 

 when cut floated off without any danger of adhering to the blade 

 (supra, p. 1089). 



Mr. J. Beck said he had not yet had an opportunity of examining 

 this apparatus, but it occurred to his mind very vividly that he saw 

 one very much like it in 1865, which was used for cutting sections 

 8 in. across. He believed he saw it at Utica, where it was being used 

 to cut sections of an entire human brain. 



Mr. Badcock described an unrecognized specimen of Adinophrys, 

 which he submitted to the meeting for identification. The central 

 bodies were described as being very bright when seen under the 



