162 PROCEEDINGS OF THE SOCIETY. 



meeting, and his claim to absolute originality shown to be erroneous 

 by the exhibition of Harris's Microscope (p. 115), obviously of con- 

 siderable age, in which the same idea had been carried out. 



Mr. W. H. Walmsley's photo-micrographs were exhibited, two of 

 which in particular (of MoUer's diatoms) were characterized by the 

 Chairman as very excellent examples of photo-micrography. 



Mr. W. M. Bale's note on Mounting in Glycerine was read. 



Dr. J. H. L. Flogel's paper on " Eesearches on the Structure of Cell- 

 walls of Diatoms " was brought before the meeting by Mr. J. Mayall, 

 jun.j who, in his preliminary remarks, said that it would be remembered 

 that some time ago they had heard reports that some one abroad was 

 making sections of diatoms, and he was requested by Mr. Crisp to 

 institute inquiries with the view of bringing the method before the 

 Society. He subsequently found that this work was being done by 

 Dr. Flogel of Holstein, who, there appeared no reason to doubt, was 

 not only a skilled and competent observer, but that he possessed 

 every kind of appliance for making careful observations. Having 

 ascertained this, the next thing was to obtain specimens of actual 

 sections of diatoms, without which it was of course not possible to 

 form any satisfactory judgment on the matter. He was fortunate in 

 persuading Dr. Schroder, now resident in London, to write to Dr. 

 Flogel upon the subject, and in the result they had received a very 

 elaborate paper accompanied by a dozen slides and a number of 

 photographs and drawings in illustration. 



A careful examination of the slides showed that Dr. Flogel was 

 thoroughly familiar with the finest processes of mounting, and with 

 all that had been done by MoUer. One of the slides was exhibited 

 in the room under a 1/25 in. objective by Mr. Powell. It was a 

 section of Triceratium favus, and the excellence of the specimen gave 

 rise to the impression that something even more difficult than this 

 could be accomplished. Amongst the other specimens sent, were 

 some very clean cut sections giving an exceptionally clear image. 

 It was stated by Dr. Flogel that as many as 174 transverse sections 

 had been made of one diatom, all of which could be plainly identified 

 as belonging to the same diatom. Mr. Mayall said that he could not 

 pledge himself as to the correctness or otherwise of the theory set 

 up by the author of the paper, as the subject was not one which he 

 had made his own, although he had taken some pains to translate the 

 paper for publication in the Journal of the Society. 



Mr. Mayall then read an abstract of the paper to the meeting, and 

 the subject was discussed by Mr. Curties, Mr. Crisp, and other Fellows. 



The Chairman in proposing a vote of thanks to Dr Flogel for his 

 paper, said that he was sure the Society would feel doubly indebted to 

 Mr. Mayall for the exertions which he had made to procure the paper, 

 and also for trouble he had taken in the matter of its translation. 



