.] 



NEW-YORK MICROSCOPICAL SOCIETY. 



77 



Of his exhibit Mr. Zabriskie said : — 



" This is an inexpensive, compact, convenient and effectual 

 contrivance for keeping a number of specimens, during macera- 

 tion in watch-glasses, free from dust and too rapid evaporation. 



" Each cover is composed of a disk of wood, 2}i inches in 

 diameter and lids of an inch thick. A cavity is turned in the 

 under side of the disk, 2 inches in diameter and niths of an inch 

 deep, this cavity being of sufficient size to easily contain an 

 ordinary deep watch-glass. A shallow depression, ^ of an inch 



"^t:;^^ 



A NEST OF WATCH-GLASS COVERS. 



Fig. 1. — A central, vertical section of a cover. 



Fig. 2. — A cover with its label and watch-glass in position. 



Fig. 3. — A nest of seven covers enclosing six watch glasses. 



in diameter, is turned in the centre of the upper surface. When 

 a watch-glass is seated in this depression, the latter tends to keep 

 the glass in position without much risk of rolling or moving. A 

 square shoulder, xsth of an inch deep is also turned around the 

 circumference of the upper surface, which shoulder loosely 

 retains the lower edge of the next superimposed cover, tending 

 to prevent the displacement of the latter. The covers are all 

 made of the same size and form, so that they are interchangable. 

 " A label, containing the name of the specimen and any 

 desired additional note, is pasted on the circumference of each 

 disk. This label refers to the specimen in the glass seated upon 

 the upper surface of each respective disk. 



