270 The Microscope. 



by an attendant who patiently explained the subject under 

 view, to each of the attendant guests, numbering some two 

 thousand, as they eagerly thronged about the various tables. 

 A noticeable display was made by the Biological Laboratory of 

 the University of Pennsylvania, in the shape of some thirty 

 microscopes, presided over by as many students, who exhibited 

 specimens of their own work, in section cutting, staining, etc. 

 The display made by the manufacturers and dealers was also 

 noteworthy, especially that of Messrs. W. H. Walmsley & Co., 

 who exhibited a complete assortment of all the instruments 

 manufactured by the Messrs. Beck ; from their grand Interna- 

 tional Binocular, costing $1,500.00 to the lately introduced 

 "Star,'' at $'25.00; as well as an endless variety of accessories 

 and apparatus for preparing, mounting and illuminating speci- 

 mens. Probably such a display of apparatus was never before 

 made at any soiree given by this old and flourishing society. 



Another novel feature, was the display in the large east 

 room, by Mr. Walmsley of a large number of lantern slides 

 made by him from Photo Micrographs; both negatives and pos- 

 itive being on gelatine dry plates. One hundred and twenty 

 slides were shown, during as many minutes, by means of the 

 superb dissolving lanterns of Mr. Frank Bennett, who not only 

 loaned them for the occasion but managed them throughout ; 

 thus insuring the success of the exhibit. The subjects em- 

 braced a great variety of mineral sections, crystals, spores, pol- 

 len, wood sections, and other specimens belonging to the vege- 

 table kingdom ; desmids, spores, Algae, whole insects and insect 

 parts, sections of hairs, bones and other animal parts. Each 

 was briefly and clearly explained by Mr. Walmsley, as one pic- 

 ture dissolved into the next, and the whole display was received 

 with cordial marks of approval. 



The museum was also brilliantly illuminated and thrown 

 open to the guests, so that in spite of the very large number 

 assembled, there was no uncomfortable crowding at any one 

 point. 



We still hold the Tolles 1-15 objective mentioned in our 

 last issue. 



