1899] MICROSCOPICAL JOURNAL. 255 



brought out a new triple nosepiece in bright lacquered 

 brass,the price of which is only seventeen shillings and six- 

 pence. It is not perhaps quite so attractive as the ordin- 

 ary trefoil-shaped pattern, but has the advantage of being 

 dust-proof and cheap. 



New Reversible Compressor. — It is made of ebonite, 

 and consists of a lower and two upper plates. The lower 

 plate contains an oblong thin glass, held in position by two 

 screws, the two upper plates contain a projecting milled 

 ring, which, when revolved, brings an upper thin glass in 

 contact with the lower glass. The whole arrangement is 

 easily taken apart and conveniently arranged, whilst it is 

 eminently serviceable. 



Dissceting Microscopes. — Messrs. Bausch and Lomb 

 have brought out two new dissecting microscopes. The 

 one consists of a small wooden case or box, 4 inches x 2 

 inches x \y 2 inches. One end of the case and the top is re- 

 movable, and serves as a cover. A small glass stage slides 

 in a groove at the top of the box, and can be replaced by a 

 glass stage with cell, opal glass stage or black glass stage. 

 Beneath is a plane mirror,andan upright rod carries three 

 lenses, magnifying from 5 to 25 diameters. The other dis- 

 secting microscope is very similar to Leitz' well-known 

 stand, but the focussing is by sliding adjustment instead 

 of by rack and pinion. 



Circuit Stage "Van Heurck" Microscope. — Messrs. Wat- 

 son and Sons have recently put upon the market a modifi- 

 cation of their well-known "Van Heurck" microscope, 

 which, by allowing more room between the stage and the 

 body, gives complete rotation to the former. This is a step 

 in the right direction. It has always appeared ridiculous 

 hat costly and elaborate microscopes of this sort should 

 }be, as we have seen them, sent out with mechanical stage, 

 centering adjustments, graduated divisions for rotation, 

 and even rack and pinion for the same purpose, yet incapa- 

 ble of rotation for more than, say, 270 deg., through the 

 screw heads of the mechanical stage fouling the body of 

 the instrument. 



