1895] MICROSCOPICAL JOURNAL. 61 



Brooklyn Institute, Brooklyn, N. Y. 



January 14, 1895.— The eighth annual exhibition of the De- 

 partment of Microscopy of the Brooklyn Institute of Arts and 

 ScieQces was held in Art Association Hall. The exhibition was 

 one of the most successful ever held under the auspices of the 

 Institute. Eighty-six microscopes were used, the visitors pass- 

 ing from instrument to instrument. The present officers of the 

 department are: H. F. Calef, president; H. S. Woodman, vice- 

 president; A. H. Ehrman, secretary ; C. P. Abbey, treasurer; 

 James Walker, curator. 



MICROSCOPICAL APPARATUS. 



A Diagnostic Microscope. — An instrument has been made 

 by Mr. Charles Baker, of High Holborn, London, at the sugges- 

 tion of Surgeon Major R. Ross, of the Army Medical Depart- 

 ment, for diagnosing cases of malaria tever, etc. It has a slid- 

 ing tube coarse adjustment, and micrometer screw fine adjust- 

 ment, square stage of sufficient size to allow any portion of a 

 seven-eighth inch cover-glass mounted on a 3 by 1 inch slip to 

 be examined. It is fitted with a substage condenser, one-twelfth 

 oil immersion objective, and eye-piece, the combination giving 

 a magnification of 700 diameters. The body can be used at a 

 length of 160 m.ra., but closes to 100 m.m. to facilitate packing. 

 The instrument is fitted in a solid leather case, six inches by 

 three inches, with shoulder strap and loops to fit to military 

 belt. A few glass slips and cover-glasses, also a bottle of cedar 

 oil and a bleeding needle are packed in the case. — Pharmaceuti- 

 cal Journal. 



MICROSCOPICAL MANIPULATION. 



To Demonstrate The Layers of Human Skin. The 



human skin is composed of four layers as follows, commenc- 

 ing with the superficial layer : 



1 Stratum covneum. 2 Stratum lucidum. 3 Granular la- 

 yer. 4 Rete mulpighii or rete mucosum. 



All ofth^se are easily demonstrated by the usual methods, 

 except the stratum lucidum. This very transparent layer re- 

 fuses all ordinary stains and is consequently difficult to dififer- 



