QUEKETT MICEOSCOPICAL CLUB. 193 



At the 54:8th Ordinary Meeting of the Club, held on 

 January 13th, 1920, the President, Dr. A. B. Rendle, M.A., 

 F.R.S., in the chair, the minutes of the meeting held on De- 

 cember 9th, 1919, were read and confirmed. 



Messrs. Leonard S. Dimsdale, Norman L. Gillespie, Cyril M. 

 Withycombe, Eric D. Mahony and Eric Fitch Daglish, Ph.D., 

 were balloted for and duly elected members of the Club. Six 

 nominations were read for the first time. 



The Secretary announced that the Annual General Meeting 

 would be held on February 10th, when the officers and committee 

 for the coming year would be elected, and Dr. Rendle would 

 deliver his presidential address. The President read the list of 

 those nominated by the committee, and four gentlemen were 

 nominated by the meeting to fill the vacancies caused by the 

 retirement of the four senior members of the committee. The 

 President announced that Mr. Wilson had been chosen to repre- 

 sent the committee as auditor, and the meeting elected Mr. Miles 

 to act with him on behalf of the members. The announcement 

 that Dr. Rendle had consented to occupy the presidential chair 

 for another year was received with acclamation. 



The President then called upon Sir Nicolas Yermolofi, K.C.B., 

 to read his paper, " Notes on Continuity and Discontinuity in 

 Nature as illustrated by Diatom Variation." Sir Nicolas said 

 that in the paper which he read before the Club in 1918 he had 

 endeavoured to trace the evolutionary relationships in a group 

 of Naviculoid diatoms so closely connected by intermediate forms 

 that it was hardly possible to tell where one form ended and the 

 next began. The line of variation of these forms might be de- 

 scribed as a line of variation in time. In the present paper he 

 proposed to make a comparative examination of several other 

 groups of diatoms — V\t. of Discoid and Gonoid diatoms, trying 

 to trace their morphological relationship with forms from several 

 fossil deposits — viz. those of Mors, Simbirsk, and Oamaru (to 

 these ought to be added that of Barbados, but this was left out 

 for brevity's sake). This variation could be called variation in 

 space. Sir Nicolas had prepared a printed comparative list show- 

 ing forms of the Discoid and Gonoid groups common and peculiar 

 to the three deposits. These deposits belong to widely separated 

 localities, they are all strictly Pelagic, and they are in some ways 

 very similar. It has been suggested that they belong to the 



