390 PROCEEDINGS OF THE SOCIETY. 



MEETING 



Held on the 16th of May, 1906, at 20 Hanover Square, W., 

 Dr. D. H. Scott, F.R.S., etc., President, in the Chair. 



The Minutes of the Meeting of the 18th of April, 1906, were read 

 and confirmed, and were signed by the President. 



The List of Donations to the Society since the last Meeting (ex- 

 clusive of exchanges and reprints) was read, and the thanks of the 

 Society were voted to the donors. 



From 

 L 1906)" The Dynami ° S ° f Livin§ Matter ' (8V °' NeW Y ° rk '} The Publishers. 

 An Old Microscope Mr. H. J. Morgan. 



Mr. Rousselet said that the Old Microscope presented to the Society 

 was an interesting specimen of a type of which they hitherto had no 

 example. The maker's name was unknown, and its age was uncertain ; 

 but though it was in a very good state of preservation, it probably 

 dated from the latter part of the eighteenth century. The focusing 

 was effected by the movement of the stage, and the objectives were 

 simple lenses ; and although not of any great value as an optical in- 

 strument, it was a very welcome addition to the Society's collection. 



Dr. J. M. Bernstein gave an interesting account of some observations 

 recently made on the parasites of malaria, and the phagocytic action of 

 the polymorphonuclear leucocytes, as observed by himself and the late 

 Mr. R. W. Newman at the Clinical Laboratory of the Westminster 

 Hospital ; the subject being illustrated by a large number of drawings 

 upon the board, showing the results of observations taken at intervals 

 of a few minutes for 5 hours. 



Dr. Hebb said he could vouch for the accuracy of the observations 

 of Dr. Bernstein and Mr. Newman, for he had frequent opportunities 

 of inspecting the progress of the phagocytosis. He first of all saw the 

 malaria crescent with a leucocyte gradually crawling up to it, then 

 another, and afterwards a third, all three of which attacked the same 

 parasite ; finally, one got the better of it and incorporated it, and 

 probably killed it. The next morning he saw it as it was shown under 

 the Microscope on the table that evening. 



The thanks of the Society were voted to Dr. Bernstein for his very 

 interesting communication. 



Mr. Beck exhibited and described an apparatus designed by Mr. 

 Nelson, in conjunction with Mr. J. "W. Gordon, for the purpose of test- 

 ing colour screens, which was roughly described as consisting of a dif- 

 fraction grating, a simple slit, a collimating lens, and an eye-lens through 

 which to view it, and mounted so as to be able to traverse the whole of 

 the spectrum. It was extremely simple, as might be judged by the easy 



