Proceedings, &c.,for 1883. 137 



April UtJi, 1883. 



Present, the President (in the chair) and 16 members and associates. 



Mr. William Bage and Mr. Charles Bage, M.B., were elected 

 associates. 



A note by Arthur Downes, M.D., and Thomas P. Blunt, M.A., 

 F.C.S., was read. The authors criticised the result of Dr. 

 Jamieson's experiments on the " Influence of Light on the Develop- 

 ment of Bacteria." 



Dr. Jamieson, in reply, said that he had made some fresh experi- 

 ments, and had written a short paper in which he hoped to maintain 

 the position he had assumed. He then read his paper. 



In reply to some questions, Dr. Jamieson stated that he had 

 placed small phials with fertilising fluid behind panes in a window 

 of three different colours — red, blue, and yellow. That which was 

 behind the red glass developed bacteria first, then, at a day's inter- 

 val, that behind the yellow, and after a few days' interval that 

 behind the blue glass ; but he had never found the bacteria quite 

 destroyed, or their development altogether suspended, by the influence 

 of any light whatever. 



Mr. Ellery said that the general result of Dr. Jamieson's work 

 seemed to make it probable that any retardation in the develop- 

 ment of bacteria was due not so much to light as to the accompany- 

 ing heat ; that even Professor Tyndall, in spite of all his skill as an 

 experimenter, had not guarded sufficiently against the occurrence of 

 that source of error. 



Dr. Jamieson said he was afraid that the direct question still 

 remained to be answered — " Does exposure to the rays of the sun 

 necessarily kill bacteria ? " 



Mr. Stirling then read his paper on the " Caves Perforating 

 Marble Deposits at Limestone Creek." Subsequently he exhibited 

 a number of specimens taken from the rocks, to which he referred 

 in his paper. 



The President stated with regret that Mr. Edward Howitt had 

 resigned the position of Honorary Secretary, and proposed that a 

 vote of thanks should be tendered him for his long and valuable 

 services. Professor Kernot seconded the motion, which was carried 

 unanimously. 



May 10th, 1883. 



Present, the President (in the chair) and 30 members and associates. 



Mr. Frank S. Outtrim was elected an associate. 



Mr. A. W. Howitt's paper on the " Rocks of Noyang " was laid 

 on the table, the President remarking that it was at the disposal of 

 any member interested in geological subjects, but that it was too long 



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