374 



"Annals and Mag:azine of Natural") -n i_ j 

 __. „ ° J. Purchased. 



History ... ... ... ) 



" LarvoD of British Butterflies and) -r, o • j. 

 Moths" 1 Ray Society. 



" On the Measurement of Lisrht and) ,/r r -i, j 

 r^ , r^ . , > Mr. Lovibond. 



Colour Sensation ... ... ) 



The thanks of the Club were voted to the donors. 



The Secretary said they had also received a prospectus of a 

 work on the Diatomaceas, to be brought out by Dr. Arthur 

 Meade Edwards by subscription, at three dollars per copy. 

 Also a more extensive work, to be edited by M. Peregallo, entitled 

 " Catalogue General des Diatomees." This was intended to be 

 somewhat upon the lines of the catalogue brought out some 

 years ago by Habirshaw, but it would be more exhaustive and 

 up to date. It was proposed to complete it in twenty-five 

 numbers, at a cost not to exceed 50fr. There must, he 

 thought, be many persons to whom such a work was likely to 

 be of great value. He also exhibited and described the chief 

 points of two new microscopes brought out recently by Mr. 

 Swift. In the main these instruments resembled Mr. Swift's 

 small model. The cheaper of the two was mounted upon a light 

 tripod stand, which was extremely firm, and when placed in a 

 horizontal position the limb rested upon the leg in a way which 

 secured great steadiness. The substage fitting and other parts 

 were made to gauge; the fine adjustment was always apt to 

 wear loose after a time, but by means of a little clamping screw 

 it could in this case always be kept tight against the anterior 

 bearing; the price with box and two objectives was only £5 15s. 

 The other microscope was somewhat similar, but rather heavier, 

 and was altogether as nice a moderate priced instrument as 

 could be desired for only £8. 



The President said he had examined these instruments, and 

 thought they were very beautiful specimens of workmanship, 

 and he was glad to find good and cheap microscopes without 

 the horseshoe foot ; they were fitted also with iris diaphragms, 

 and microscopes of this kind were capable of doing first 

 rate work. The only thing he objected to was the arrangement 

 of the stage, which had two grooves ploughed into the top. 

 He was also opposed to spring clips, which prevented anyone 

 from feeling the distance ; this had caused more breakage to 



