128 PROCEEDINGS OF THE SOCIETY. 



that only require mounting between two thin glass covers with balsam, 

 and the experiment is pretty and instructive." 



The thanks of the Meeting were voted to Mr. Large for his very 

 interesting exhibit and description. 



Mr. J. E. Barnard exhibited some specimens of luminous Bacteria 

 contained in a number of culture tubes, and also in large quantities in 

 a solution in a flask. On the lights in the room being turned off, the 

 light given off by these organisms was at once seen. The contents of 

 the flask whilst undisturbed remained dark, but became very luminous 

 when agitated. It was explained that the light produced was nearly 

 monochromatic, and in position was between the lines F and G in the 

 spectrum. The whole of the energy of these bacteria seemed to be 

 utilised in producing light, as no heat whatever could be detected. 

 Mr. Barnard did not propose to give any description of the organisms 

 producing the light, nor as to the preparation of the examples before 

 the Meeting, but intimated his willingness to do so on a future occasion 

 if the matter was of interest to the Fellows of the Society. (A further 

 exhibition of the tubes was given in a dark room at the close of the 

 Meeting.) 



The Chairman said they must give a very hearty vote of thanks to 

 Mr. Barnard for his very interesting exhibit, and expressed a hope that 

 he would tell them something more about the subject at some future 

 date. He said it seemed almost to suggest that when their coal and gas 

 gave out, they might perhaps be growing bacteria to light their rooms ! 



Mr. E. M. Nelson's paper, " Gregory and Wright's Microscope," 

 was read by Dr. Hebb, a photograph of the instrument being handed 

 round for inspection. 



Mr. Nelson's paper, " A Co^-ection for a Spectroscope," was also read 

 by Dr. Hebb, and was illustr. I by a diagram. 



The thanks of the Society ^re unanimously voted to Mr. Nelson 

 for these communications. 



A paper by Mr. James Murra) on " Some African Rotifers," was 

 read by Mr. Rousselet, and was ill I *ated by drawings of the species 

 mentioned as having been collect*. J Cape Colony, Uganda, and 



Madagascar. 



Mr. Rousselet mentioned that at th ent time Mr. Murray was on 



his way to the Antarctic regions on bo;. e Nimrod, sent out by the 



British Antarctic Expedition, 1907, and ntending to spend twelve 



months there. He had daily devoted so of his time during the 

 voyage to the Cape in endeavouring to procc e marine rotifera from the 

 Atlantic, but had failed to find any. Mr. R> elet further stated that 

 this agreed with the experience of the Germ; Mankton Expedition of 

 1889, who found no rotifers in the Atlantic .opt in two limited and 

 widely separated areas, the one in the North A I lantic midway between 

 North Britain and Greenland, where two species -, nchceta 'and Rattuhis) 

 were found in enormous numbers, and the oth off Bermuda, where 

 the same two species were again encountered. 



