347 



Messrs. T. Hiscott, P. J. Bunting, and J. H. East were 

 balloted for and duly elected members of the Club. 



Mr. C. Lees Curties, F.R.M.S., exhibited and described the 

 simple form of Apertometer suggested by Mr. F. J. Cheshire, 

 F.R.M.S., and figured and described in the Journal Q.M.C., 

 Ser. II. Vol. IX., p. 1, 1904. The readings obtainable are 

 accurate within N.A. 0*05. The form of the instrument shown 

 has just been placed on the market by Messrs. Baker. Mr. 

 Curties also described a form of mercury-vapour lamp adapted for 

 use as an illuminant for microscopy. A microscope was shown 

 having on one side a mercury-vapour lamp, and on the other 

 side an ordinary oil lamp. Using light from the oil lamp, the 

 object, A. pellucida, was resolved into lines; but, on adjusting 

 the mirror to receive light from the mercury-vapour lamp, the 

 diatom was shown well "dotted." The form of lamp shown, 

 which, it was understood, would shortly be placed on the 

 market, was adjusted to fcake direct current h ampere at 100 

 or 200 volts. 



Mr. W. B. Stokes (Hon. Secretary) wished that the mercury- 

 vapour lamp was generally available, as it would simplify matters 

 very much. We should have no secondary spectrum to worry 

 us, and objectives corrected for a few wave-lengths only could 

 be made at very much less cost than those now in use. 



Mr. R. T. Lewis, F.R.M.S., exhibited and described a number 

 of very beautiful preparations of insects, chiefly of those of 

 brilliant colouring. One of the most striking was a specimen 

 of the rare Isthmia patruelis (Homoptera) from Natal. An 

 instance of protective mimicry was shown in Phyllomoiyha 

 laciniata (Hemiptera Heteroptera), also from Natal (it is 

 found on a lichen, to which it bears a remarkable colour re- 

 semblance) ; and a series of four preparations, which, Mr. Lewis 

 said, would remind old members of a long controversy, about 

 the end of the '-sixties," as to where certain hairs came from ! 

 These were the hairs known as " of the larva of Dermestes." 

 He had proved them to be derived from the pupa of Anthrenus 

 museorum, and also from the larva of Tiresius serra. 



The President exhibited some preparations of spicules of 

 calcareous sponges showing the axial filaments stained. In 

 describing them, he said that the presence of a thread of organic 

 matter in the axial canal of siliceous sponge spicules had been 



