( G97 ) 

 PEOCEEDINGS OF THE SOCIETY. 



Meeting op 8th June, 1887, at King's College, Strand, W.C, 

 THE Pkesident (the Eev. Dk. Dallinger, F.E.S.) in the Chair. 



The Minutes of tlie meeting of lltli May last were read and 

 confirmed, and were signed by the President. 



The List of Donations (exclusive of exchanges and reprints) received 

 since the last meeting was submitted, and the thanks of the Society given 



to the donors. 



From 

 Crookshaiik, E. M., M.B., Manual of Bacteriology, 2nd ed., xxiv. 



and 439 pp., 29 pis. and 137 figs. (8vo, London, 1887) .. The Author. 

 Lithograph of Microscopic Objects under the same magnifying 

 power (the original was given to the late Dr. Carpenter, C.B., 

 by Dr. Oliver Wendell Holmes, by whom it was drawn) .. Dr. P. H. Carpenter. 

 Photomicrographs of Diatoms (x 840). No. 71, Nitzchia (?) with 

 membrane attached ; No. 66, Cocconeis (lower plate), with mem- 

 brane attached ; No. 175, Cocconeis (another negative) with 

 membrane attached ; No. 73, cast of Heliopelta (?) ; No.74 do. Col. R. CEara. 



Col. R. O'Hara's note on the "Means of Movement possessed by the 

 Diatomaceee" was read as follows: — 



" In my former communication on this subject I stated that I believed 

 that in many cases this means of movement consisted in an undulating 

 membrane, and I gave a drawing of the same as attached to Navicula. I 

 send now an enlarged photograph of the membrane as attached to 

 Pinnularia or Nitzchia, and also an enlarged photograph of the lower plate 

 of a Cocconeis with the membrane attached, and showing the undulations 

 exactly, as I thought, I had seen in action as stated in my former note. 



I further send two photographs of what I take to be casts of Actinocyclus 

 or Heliopelta, many of which were in the gathering ; but as I have not, so 

 far, found them attached, they may be anything else. They will, however, 

 explain most distinctly what I mean by the expressions, cast, and undu- 

 lating membrane." 



Mr. J. Deby said that he was stated at the last meeting (ante, p. 533) 

 to have given slides of Pediculus to the Society. This was, however, an 

 error, and the slides were much more interesting, as being the original 

 slides which led to the discovery of the development of Meloe, a parasite 

 of bees. The older naturalists, who did not know what these little lice- 

 looking creatures were, had named them very erroneously Pediculus Melitfse. 

 This " Pediculus " was the larva of a coleopterous insect, and undergoes a 

 metamorphosis which the genuine Pediculi are exempt from. 



Mr. Crisp read a letter from Mr. L. Dreyfus, late a member of the 

 Council, who was now residing at Wiesbaden, accompanying a notice as to 

 the Scientific Exhibition in connection with the 60th Congress of German 

 Naturalists and Physicians, to be held in Wiesbaden from the 15th to the 

 24th September next, the attendance usually numbering about 3000. It 

 is intended to be strictly scientific, not mercantile, and as its purpose will 

 be to show at a glance the latest and most 'perfected instruments and 

 apparatus which have been placed at the disposal of science and medicine 

 in the last few years, anything that cannot lay claim to be ranked in this 

 category will be rigorously excluded. No charge will be made for space, 

 insertion in catalogue, or anything else, and the instruments will be 



1887. 2 z 



