670 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



two movements are effected by rack-and -pinion, by which an equal 

 rate of progression is secured : they are actuated by two milled heads 

 mounted on a common spindle on the Turrell system, and though the 

 position of the heads is unusual it is found in practice to be extremely 

 convenient. In size the stage is the same as that of the " H " Edin- 

 burgh Student's Microscope, but if desired it may be ^removed and 

 replaced by a plain plate fitting in the same dovetails. 



Fig. 15G. 



Watson's New Pattern Portable Microscope. — Figs.'156 and 157 

 show the new pattern portable Microscope which was exhibited and de- 

 scribed by Mr. F. W. Watson Baker at the Meeting on June 20th : see 

 ante, pp. 562-3. 



New Microscopical Stand with a Movable^ Stage capable of 

 Large Movements.* — CI. Eegaud and Nachet describe a stand which 

 has a special form of movable object-stage and is geared so that the stage 

 can be moved up and down. The stage is adapted for large object- 

 slides 85 by 50 mm., and by means of a mark the object-holder can 

 always be accurately brought back into the same position. Every part 

 of the upper surface of the object-holder can be brought into view and 



* Arch. d'Anat. Micr., v. (1902) pp. 17-21 (2 figs.). 



