1894.] NEW-YORK MICROSCOPICAL SOCIETY. 21 



that, when they are bent round, they enclose about two-thirds 

 of the circumference of a bottle. Each brass strip has a hole 

 punched in the centre, through which is passed a screw, one- 

 quarter of an inch long, for holding the clip in position in the 

 tray. These spring clips hold the bottles with sufficient firm- 

 ness to prevent the bottles from falling out, and still to allow 

 any one bottle to be extracted and replaced easily without dis- 

 turbing any of the others. 



An additional piece of white wood is inserted behind the bot- 

 tles, one-eighth of an inch thick, and as long as the long side 

 of the tray, but of such width that it reaches from the bottom 

 of the tray only up to the necks of the bottles. Wood more 

 than.one-eighth of an inch thick would appear clumsy for such 

 small trays. This additional piece of wood, which is scarcely 

 noticeable behind the bottles, together with the thickness of the 

 brass, prevents the screws, one-quarter of an inch long, from 

 passing entirely through the wood and projecting at the outer 

 side of the tray. Screws less than one-quarter of an inch long 

 would be too small to handle with convenience. 



If larger bottles are needed, larger trays and larger clips 

 must be employed. Some of the specimens exhibited are pre- 

 served in dilute alcohol and others in dilute glycerin. But the 

 arrangement is equally convenient for dry specimens in bottles, 

 as diatomaceous material, etc. 



An easily interchangeable label is very desirable for such a 

 collection. The method here exhibited can be recommended 

 for ease of construction and satisfaction in use. A slight cir- 

 cular cavity is bored in the face of the front piece of each tray 

 with a centre bit, seven-eighths of an inch in diameter ; a disc 

 of white paper is dropped into the cavity ; and the paper is re- 

 tained in position by a single coil of brass wire, which has suffi- 

 cient spring to resist falling out from any accidental jar, and 

 yet will allow of easy extraction by means of the finger nail, in 

 order to insert another label. 



A convenient draw pull, to extract any tray from the cabinet, 

 is made with a three-eighths inch brass screw ring, the screw of 

 which is passed through a small washer, and inserted in the 

 front of the tray below the label. 



