The President's Address. By E. M. Nelson. 155 



by Keichert, which had a new form of lever fine adjustment adapted 

 to the Continental stand. Those acquainted with Microscope construc- 

 tion have expressed their conviction that this ingenious and thoroughly- 

 practical adaptation must effect a speedy revolution in direct-acting 

 screw fine adjustments, as at present fitted to Microscopes of the Con- 

 tinental pattern. The same firm also exhibited a new electrical hot 

 stage by Keichert ; and a very simple form of portable Microscope by 

 Leitz, eminently suitable for doctors for bedside diagnosis. They also 

 showed a new D.P.H. stand of their own manufacture ; the fine 

 adjustment is of the long first order lever type, it has a mechanical 

 stage and substage, and it is a Microscope designed to meet the 

 wants of bacteriologists. Messrs. Beck and Co. brought a new form 

 of compressor made of ebonite, and consequently very light ; it was 

 designed by Mr. H. R. Davis. Messrs. Watson and Son exhibited a 

 new low-power binocular dissecting Microscope by Leitz, consisting 

 of a pair of Briicke lenses mounted upon an adjustable stand ; a large 

 Microscope of their own manufacture, which had a mechanical stage, 

 capable of being rotated through an entire circle ; a very simple and 

 ingenious hot stage and stage preserver, designed by Mr. G. T. West ; 

 also a new cheap School Microscope, which they have built very sub- 

 stantially, and which has an excellent coarse, but no fine adjustment. 

 They have also introduced a new eye-piece called " Holoscopic " ; this 

 is an ordinary Huyghenian eye-piece fitted with a sliding adjustment, 

 which permits the distance between the eye-lens and field-lens to be 

 altered, and gives it a considerable range of correctional adjustment. 

 Messrs. Zeiss have exhibited a new low-power binocular ol great ex- 

 cellence, in which two objectives are used, and erection performed by 

 Porro prisms. It is necessary in this form of binocular to erect the 

 image, otherwise the image would be pseudo-stereoscopic. They also 

 exhibited an entirely new form of Microscope, in which the fine adjust- 

 ment is actuated by means of the interposition of an endless screw. It 

 also has a new form of stage movement, inasmuch as the vertical move- 

 ment is one in arc, which is accomplished by pivoting the stage-plate 

 on one side, and by moving the other by a rack-and-pinion motion 

 worked by an endles-; screw. 



It is with pleasure that I draw attention to the many interesting 

 subjects which are now brought before our monthly meetings. Among 

 these may be mentioned an excellent demonstration with the lantern 

 Microscope by Mr. Lewis Wright ; a first-rate lecture on the Trap- 

 door Spider by Mr. Enock; a first-rate exhibition of Pond Life by the 

 Quekett Microscopical Club ; and a capital collection of those marvel- 

 lously beautiful objects the Foraminifera by Mr. A. Earland. 



]3r. Spitta kindly gave an excellent demonstration on Photomicro- 

 graphy. A large number of his beautiful slides were thrown upon the 

 screen, and as a short explanation accompanied each slide, the exhibi- 

 tion was rendered interesting and instructive. 



A great amount of time and thought must have spent upon these 



M 2 



