181 



convex lens silvered upon the back surface he would find it very effective, and 

 very little trouble would arise from reflections from the upper surface. Such a 

 plan was in common use on the Continent for opthalmoscopes, and was found to 

 answer very well. 



Dr. Matthews explained that his observations had only referred to the use of 

 a plane mirror ; the presence of a lens would be rather foreign to the purpose. 

 Mr. Ackland said of course his suggestion was for a concave mirror only ; 

 he was under the impression that Dr. Matthews had used the concave surface. 



Mr. B. T. Lowne related some very interesting facts in connection with the 

 development of certain Hymenopterous insects, illustrating his remarks by 

 numerous diagrams and by drawings upon the black board. 



The President, in proposing a vote of thanks to Mr. Lowne for his extremely 

 interesting communication, characterised the subject as one of the greatest 

 importance, and expressed a hope that many other persons might be induced to 

 take up the study. Mr. Lowne had made this field so entirely his own that his 

 remarks were sure to be received with great pleasure and interest by the mem- 

 bers of the Club, on whose behalf he ventured to express a hope that this had 

 only been the first of a series of similar communications. — The vote of thanks 

 was then put to the meeting and carried unanimously. 



The proceedings then terminated with a conversazione, at which the following 

 objects were exhibited : — 



Professor Brown's Pocket Microscope on ") 



Special Stand ) 



Balanus balanoides 



Wing of Morpho Menelaus 



Conochilus Volvox (collected at Snaresbrook "> 

 excursion, April 19th, 1873) .. ... ) 



Skin of Dog Fish 



New Super-stage for oblique illumination ... 



Ptilota elegans 



Wing case of diamond beetle and Platino") 



Cyanide of Magnesium ) Mr. Topping. 



by Mr. Crisp. 

 Mr. Fitch. 

 Mr, Golding. 



Mr Hainworth. 

 Mr. Kitsell. 

 Dr. Matthews. 

 Mr. J. C.Sigsworth. 



Attendance — Members, 78 ; Visitors, 3. 



9th May, 1873. — Conveesational 



Section of Blow Fly's Eye 



Leg of Cyphus nigro-punctatus 



Corethra Plumicornis in different stages, ") 

 larva to imago ... ... ... ... ) 



Section of Ficus elastica... ... 



Head of Cicendela Chin ensis 



Members, 46; Visitors, 7. 



