132 



December 17th, 1875. — Dr. J. Matthews, F.E.M.S., 

 President, in the Chair. 



The minutes of the preceding meeting were read and confirmed. 



The following Donations to the Club were announced: — 

 " The Monthly Microscopical Journal" ... ... from the Publisher. 



" Science Gossip" ... ... ... ... ... „ „ 



<' The Microscope in Gynaecology," by Dr. j the Author _ 



A. Mead Edwards j 



" Owen's Lectures on the Invertebrates" ... „ Mr. Bywater. 



" The American Naturalist" ... ... ... in exchange. 



" Lecture upon the Geology of Croydon" ... from Profr. Morris. 

 " Eeports of the Medical Officer of the Privy ) „ ^.^ ,, 



Council" ... ... ... ... ) 



Part 6 of " Schmidt's Atlas of the Diatomaceae'' by subscription. 



A large lithographic print of the tongue of the j from Mr _ WatkinS- 

 blow-fly ... ... ... ... ) 



A Photographic Portrait for the Club Album... „ Mr. Mclntire. 



Six Slides „ Mr. E nock. 



The thanks of the Club were unanimously voted to the donors. 



The Secretary announced that Herr Moller's proposed work on the pre- 

 paration and mounting of diatoms, to which attention had been called upon 

 a former occasion, would not be published, in consequence of the number of 

 subscribers for it being deemed insufficient. 



Mr. Watkins, iu reply to a question from the President, said that the print 

 which he had presented to the Club was given to him by the late Mr. 

 Topping, as being the last one he had. He believed that not more than 300 

 of them were struck off, and they were now becoming very scarce. 



Mr. Topping stated that his father first prepared the proboscis of the blow- 

 fly, in the manner shown in the print, in 1842. The object was very much 

 admired, and Mr. Eoss and others suggested that it should be lithographed, 

 which was accordingly done in 1844. The expanded position of the lobes 

 was considered by some to be unnatural, because the blow-fly was generally 

 examined when feeding on syrup ; but it would be observed in the case of a 

 fly which was tasting vinegar, or any other substance it did not approve of. 



Mr. A. Caplatzi, Mr. Thos. Farries, Mr. C. L. Jackson, Mr. Thos. May, 

 Mr. Mansell Swift, aud Mr. W. Tidmarsh were duly elected members of the 

 Club. 



Mr. Curties stated that Mr. Davis was not able to be present that even- 

 ing to read his paper " On a larval Cirripede." He had sent the paper and 

 drawings, but Mr. Curties thought the subject would have more justice done 

 to it if introduced by Mr. Davis himself, and the paper was accordingly 

 postponed till the next meeting. 



Mr. Ingpen gave a description of the various methods employed from time 

 to time for measuring the angular apertures of objectives, of which the follow- 

 ing is an abstract: — Down to the year 1854, the method of measuring angular 

 apertures devised by Mr. Lister, seems to have been the only one employed. 

 This is described in the Phil. Trans., Vol. 121, p. 191, and will be found in 



