PROCEEDINGS OF THE SOCIETY. 267 



the right-angled prism was figured and polished, and how perfectly this 

 had been done in the instrument before them was rendered evident by 

 the clear resolution of a slide of Amphipleura pellucida placed on the 

 stage. The prism is carried in a sliding fitting, and may be placed in 

 or out of use without interfering with any adjustments of the instru- 

 ment. 



Mr. F. W. Watson Baker, for Messrs. W. Watson and Sons, ex- 

 hibited a Microscope fitted with a new two-speed fine adjustment. The 

 ordinary single micrometer-screw carries a milled stem of small dia- 

 meter, of convenient length, above the usual large milled head. The 

 former may be rolled rapidly between thumb and finger to obtain a 

 quick fine adjustment, whilst the full-sized milled head remains available 

 for a final delicate adjustment. The ratio between the two speeds is 

 obviously that of the diameters of the milled head and the milled stem 

 respectively, which in the case of the instrument exhibited was about 

 six to one, but the speed may be varied to suit individual requirements. 

 He also showed their well-known " Fram " Microscope fitted with a 

 mechanical stage, as in the " H " Edinburgh Student's Microscope, but 

 without the revolving top-plate. 



On the motion of the President, votes of thanks were passed to 

 Mr. Beck and to Mr. Baker for their exhibits and the explanations given. 



Dr. Hebb said they had received another paper from Mr. F. W. 

 Millett, being Part 13 of his series of communications ' On the Fora- 

 minifera of the Malay Archipelago.' This paper, like those which had 

 preceded it, would be taken as read, and would appear in due course in 

 the Journal. 



Mr. C. F- Rousselet presented a third list of new Eotifers which 

 •had been discovered since 1889. The introduction to this paper only 

 was read, in which it was stated that the additions now recorded were 

 98 in number, making in all 393 new species since the time of Hudson 

 and Gosse. Occasion was taken to protest strongly against persons who 

 were unacquainted with what had already been done, giving new names 

 to old species which they themselves had found for the first time ; the 

 value of careful drawings or- mounted type specimens being pointed out 

 as a means of preventing this cause of confusion. 



The President said that the thanks of the Meeting had already been 

 signified by the way in which this paper had been received. He hoped, 

 however, that it would not be long before Mr. Eousselet would be able 

 to give them the figures as well as the descriptions of the Eotifers 

 referred to. 



The following Instruments, Objects, &c, were exhibited: — 

 Messrs. E. and J. Beck : — Prof. Huntingdon's Tilting Stage. Ob- 

 serving Prism for use in Photomicrography. 



Messrs. W.Watson and Sons: — A new Two-speed Fine Adjustment. 

 The " Club Fram " Microscope. 



