335 



surface which can be brought under examination. The stage 

 measures 20 x 16 cm., and practically every point in this area can 

 be brought under the lens ; this is efifected by two mechanical 

 movements, the stage itself moving backwards and forwards by 

 rack and pinion, and the microscope transversely by means of a 

 quick-acting screw ; both movements are provided with graduated 

 scales, and illumination is secured by a long rectangular mirror. 

 Such an instrument will perhaps find its chief use in the 

 Bacteriological Laboratory for the examination of plate cultures. 



The Leitz-Dolken Stand. — This instrument is a modification of 

 their well-known stand No. 1. Focussing and substage adjust- 

 ments are identical, the modification being in the distance from 

 optic axis to limb, or pillar carrying the fine adjustment. The 

 short distance usual in all Continental models makes the 

 examination of large bacteriological culture plates difficult, if 

 not impossible. In the present model this distance is increased 

 to about double that usually available, and is obtained by 

 mounting the upper part of the microscope on one limb of an 

 U-piece, the other limb being firmly attached to the stage. 

 Large culture plates can thus be passed under the pillar carrying 

 the fine adjustment. 



The President said the latter of these instruments was a very 

 old stand indeed, with a greater length of arm than usual. It 

 was exceedingly solid and well made, and provided with a 

 substage and condenser. The other seemed to be extremely 

 novel, and of use chiefly for large sections. 



Mr. Karop said the Leitz-Nebelthau microscope was obviously 

 a specialists' instrument, and would no doubt be found very useful 

 for looking over very large sections say of brain, or bone, or 

 sections of wood. It was gi^aduated in both directions, which would 

 enable the position of any point of interest to be recorded for 

 future reference. It no doubt had its special uses, but it was alto- 

 gether a too elaborate instrument for the ordinary microscopist. 

 The other instrument seemed to have nothing particularly new 

 about it, except the point which had been mentioned ; but he 

 thought the price (=£10) would hardly conduce to its adoption. 



The thanks of the Club were voted to Messrs. Baker for 

 sending these instruments for exhibition. 



Dr. Tatham said he had an announcement to make which 

 he felt would be received with feelings of great regret : it was 



