88 



the required angles (from 35° to 175°) was laid down upon a line drawn on a 

 sheet of paper. At two points at right angles to this line small flames, such 

 as that of a night light, or strips of white paper could be placed. By ad- 

 vancing the objective along the scale, the images of the flames or other objects 

 employed were separated, until each was seen on the opposite margins of the 

 posterior lens of the combination, when the angle of the objective was indi- 

 cated directly beneath its front lens. A second scale was provided for 

 measuring angles from 18° to 40 Q . A holder for carrying the objective was 

 also exhibited. 



The President pointed out that in using the scale it was of importance that 

 the mount which carried the objective should be kept fairly at right angles 

 with the engraved line, and it would be also found desirable when using high 

 power glasses to amplify the images produced by them by means of a magnifying 

 lens held at the back. 



A question asked by Mr. Hainworth as to the issue of slides from the 

 cabinet gave rise to some discussion upon the subject, in the course of which 

 it was stated that during the absence of Mr. Buffle (Curator) — who was pre- 

 vented by severe domestic affliction from attending to his duties — Mr. Hailes 

 had kindly attended on the gossip nights for the issue and exchange of slides. 

 The cabinet had not been open on the evenings of the ordinary meetings from 

 want of time and pressure of other business, but if any gentlemen wished for 

 slides on those occasions, and would apply to Mr. Hailes, he would be happy 

 to oblige them in the matter as far as practicable. 



The Secretary called the attention of the meeting to two lamps which had 

 been sent for their inspection by Mr. Parkes, of Birmingham. They were 

 similar in construction, and both burnt mineral oil, but one had a flat wick 

 and the other a round one ; the reflector— by which the flame was partially 

 enclosed — was intended to throw a beam of parallel rays, and a tinted glass 

 cover to the opening of the reflector served to correct the yellowness of the 

 flame. 



The President observed that the flame was not quite in the focus of the 

 reflector, and that the latter was rather conical than parabolic. If it were 

 made a true paraboloid, and the flame was placed in the proper position, still 

 better effects might be obtained from it. 



Dr. Poulerton gave notice that at the annual meeting he would move as an 

 addition to the bye-laws "That the ordinary meetings of the Club be sus- 

 pended during the months of August and September." He thought it would 

 be found convenient to do this, and to follow in this respect the course 

 adopted by all the other scientific societies. This alteration was not intended 

 to suspend the gossip nights, and there might be additional gossip nights on 

 the fourth Fridays in those two months instead of the ordinary meetings. 



The notice of motion was seconded by Mr. F. H. P. Hind, who thought 

 the proposition very proper and desirable. 



Mr. B. T. Lowne gave a second address upon the histology of the eye, in 

 which, after recalling the substance of his former communication, he pro- 

 ceeded to illustrate and explain the minute structure of the retina, the rods 

 and cones, &c, and gave the most approved methods of hardening, cutting, 

 and mounting sections for microscopic examination. 



Announcements of meetings and excursions for the ensuing month were 

 made and the meeting terminated with a conversazione, at which the following 

 objects were exhibited : — 



