335 



The list of donations to the Club was read and the thanks of 

 the members were voted to the donors. 



Dr. T. W. Butcher, of Blackpool, sent for exhibition a series of 

 photomicrographs of Amphipleura Lindheimeri, taken under the 

 following conditions : Homogeneous oil-immersion 2 mm. apo- 

 chromat, compens. ocular x 6, tube-length 170 mm., initial 

 magnifying power x 7G4, achromatic substage condenser, screens 

 D and H of Wratten k Wainwright's " M " series, illuminant 

 Liliput arc-lamps (8 amps.). Ordinary backed plates (225 H. 

 and D.) ; developer, metol hydrokinone; exposure, 12 sees. Also 

 three higher-power photographs taken as above, but with compens. 

 ocular X 18. The photographs showed the diatom well resolved 

 from end to end. In a covering note Dr. Butcher said the points 

 were simply a straightforward example of direct-light illumination 

 with the particulars given, and were more a demonstration of lens 

 efficiency than of revealing structure. 



Mr. C. L, Curties exhibited a series of slides mounted by Mr. 

 Waddington illustrating the development of the trout from the 

 ovum to fifteen weeks old. 



The Chairman moved a vote of thanks to the preparer of these 

 slides and also to Mr. Curties for exhibiting them remarkinir 

 that the exhibition was a unique one, and such as they would 

 have little opportunity of seeing unless they were brought to their 

 notice in this way. 



Mr. C. D. Soar, F.L.S., F.R.M.S., read a paper on " The ^York 

 of the late Saville Kent on British Hydrachnids." 



Mr. D. J. Scourfield congratulated Mr. Soar on having had the 

 opportunity to see and use Saville Kent's work. It was very 

 interesting to have an account of what Saville Kent had in mind 

 to do, and how much material he had collected arid partly examined. 

 It was a great pity that Saville Kent was not able to complete 

 this work. 



Mr. C. r. Kousselet said that the probable cause was that 

 Saville Kent was sent to Australia for a number of years to study 

 coral reefs, and this, of course, took him away from the study of 

 water-mites. 



The thanks of the meeting were voted to Mr. Soar for his paper. 



A paper contributed by Mr. E. M. Nelson, F.R.M.S., on 

 *' Methods of Illumination," was read by the Hon. Secretary (Mr. 

 W. B. Stokes). 



