1899] Microscopical journal. 256 



brought out a new triple nosepiece in brig-ht lacquered 

 brassjthe price of which is only seventeen shilling-s and six- 

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

 ary trefoil-shaped pattern, but has the ad vantage 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 g-lass, 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 1% 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. 



