THE MICKOSCOPE. 169 



THE MICROSCOPE. 



New Series, 1893. 



For Naturalists, Physicians, and Druggists, and Designed to Popularize 



Microscopy. 



Published monthly. Price $1.00 per annum. Subscriptions should end 

 jj'.th the year. The old series, consisting of 12 volumes (1881-1892), ended 

 with December, 1892. Sets of the old series cannot be furnished. All 

 correspondence, exchanges, and boohs for notice should be addressed to the 

 Microscopical Publishing Co., Washington, D. C, U. S. A. 



CHARLES W. SMILEY, A. M., EDITOR. 



EDITORIAL, 



W. WATSON & SONS' CATALOGUES OF MICROSCOPES 

 AND MICROSCOPIC OBJECTS. 



In the Microscope Catalogue just issued, we notice more space 

 given to the Van Heurck Microscope which seems to gain an 

 increasing amount of favor and is already used by many of the 

 most renound workers. The makers have devised a new form 

 of rackwork draw-tube at a very low price specially for the 

 Edinburgh Student's Microscope, and have adapted the tripod 

 foot to this stand. Buyers can choose between this and the 

 horse-shoe. On page 44 will be noticed particulars of Mr. Nelson's 

 new semi-mechanical Stage as described by him at the Royal 

 Microscopical Society's meeting in March last. We have also 

 observed a new series of Aplanatic Magnifiers having powers to 

 6, 10, and 20 diameters. They give a large and flat field com- 

 bined with good working distance, and are especially intended 

 for dissecting purposes. The Laboratory Dissecting Microscope, 

 page 57, being provided with a fitting to receive the same. 



Messrs Watson have not been able, so far, to use aluminum 

 in the construction of microscopes to any extent, but in the var- 

 ious pieces of apparatus have found it useful and now mount 

 the Abbe Illuminators and the Achromatic Condenser quoted 

 on pages 62 and 63 in that metal. Owing to the size of the 

 Lens they are of necessity somewhat clumsy, and the aluminum 

 affords a verv considerable reduction in weight. Thev al^o 



