1893.] MICROSCOPICAL JOURNAL. 207 



EDITORIAL. 



Terrace dust. — Tlie interestinp; paper on this subject in the 

 March number, ])age 72, has been repUed to by Mr. Cuuninghani, 

 on page 205 of the present number. The samples wliich lie for- 

 warded we have hastily examined. They bear a striking resem- 

 blance to the dust found in Calcutta, but absolute identity of 

 origin cannot be affirmed at present. We shall be glad to re- 

 ceive some "dust " irom Calcutta for comj)arison with that of 

 Mr. Cunningham. We have forwarded the samples submitted 

 b}' him to Calcutta. 



The final assumption would be that the spherules in the dust 

 are ''of the eartb, earthly," and not of "cosmic origin " as was 

 at first suspected by the Calcutta observer. 



MICROSCOPICAL APPARATUS. 



Hicks' New Medical Microscope. — Mr. Jas. J. Hicks, of 

 Hatton Garden, whose name is so indelibly stamped on the 

 philosophical instrument industry, had not been long engaged 

 in the construction of fine microscopes before he introduced a 

 pattern which has already made its mark. The " Medical " 

 Microscope is expressly designed to provide doctors with a first 

 class microscope at a low figure. It is fitted with a bright solid 

 foot that enables it to stand with exceptional steadiness, and 

 shaking is reduced to an absolute minimum. It possesses two 

 eye-pieces and two specially-constructed objective glasses, of 

 1-6 inch and 1-10 inch; a massive circular brass stage, flat and 

 concave mirrors, that are attached to a revolving arcn by a very 

 neat motion, which enables the observer to place them in any 

 position to the right or left of the stage and either above or be- 

 neath it. The microscope has also coarse and fine adjusting 

 screws, stand condenser, live-cage and a pair of tweezers. The 

 instrument as a whole is exceedingly handsome, and whether 

 placed in the surgery, study, or laboratory', w 11 not fail to at- 

 tract attention and admiration. It is fitted into a neat polished 

 mahogany cabinet with lock and key. Though designed spe- 

 cially for medical use it is equally appropriate for other j)ursuits 

 or studies. The retail price of this instrument complete is £12 

 {$QO).—The Optician. 



