The Microscope. 143 



one admitting bearer and friends, and, judging from the number 

 present, a very large proportion of them were used. 



Space forbids the detailed description of exhibits which their 

 merit entitles them to, but we cannot refrain from noticing a few of 

 the most prominent. Mr. H. B. Baldwin exhibited butter- crystals 

 by polarized light. Dr. E. S. Day, a finely-injected retina of rat ; 

 Dr. J. H. Hunt, two sections of human scalp cut vertically and 

 transversely ; T. B. Briggs, Esq., a section of syenite from the 

 obelisk ; Mr. H. S. Woodman, the multiple image of the second- 

 hand of a watch in a beetle's eye, the perfect management of the 

 illumination and the clearness of the image in this exhibit deserve 

 special mention. A section of pearl by Mr. H. W. Calef was very 

 much admired. Dr. S. E. Steles exhibited a section of skin show- 

 ing sweat ducts, which elicited much admiration. A section of 

 luxulyanite by J. W. Freckelton would have been a revelation to 

 some mineral section grinders. Mr. C. J. Lawler showed the 

 lanceolated hairs of Dermestes, with a Bausch & Lomb half inch, 

 which provoked as much admiration for the perfect definition of the 

 objective as for the beautifully -mounted specimen. This exhibit 

 was mounted on one of the Bausch & Lomb Optical Company's 

 inverted chemical stands, and it was remarked by an elderly mem- 

 ber that this was the first time he had seen a microscope turned 

 iipside down to look around a corner. Mr. Joseph Ketchum ex- 

 hibited a slide of arranged polycestina by upper illumination, on a 

 Beck international binocular, with a Bausch & Lomb one inch of 

 45^; a slide of lozenge-shaped crystals of asparagin with polarized 

 light on a Bausch & Lomb prof essional stand, and one-half inch of 

 the same make of 61*^; a finely stained and injected section of the 

 intestine of cat on a Baiisch & Lomb Harvard and specimens of 

 cholera bacilli on a Bausch & Lomb model stand with a one- 

 sixth dry objective of 140'^ of the same make. The illumination 

 of this group of instruments was by a novel and convenient form 

 of lime light. It was in shape somewhat like a student lamp, the 

 reservoir containing alcohol which was supplied to the burner in a 

 fine jet when it was vaporized by a jet of oxygen and projected 

 against a small lime pencil. The light was screened from the 

 observer's eyes by a sheet-iron shade in place of the usual porcelain 

 one, and the oxygen was supplied from a small cylinder twelve by 

 three inches in size. The whole equipment was convenient, simple 

 and satisfactory. 



Mr. Henry E. Fink, of the Bausch & Lomb Company, ex- 

 hibited the eleventh commandment in the eve of a needle on their 



