COLLECTING- STICK. 



193 



inches in length, open at both ends, and from one- 

 eighth to one-fourth of an inch in diameter. The ends 

 must be nicely rounded off in the flame of a blow-pipe; 

 some of them should be made perfectly straight, whiJe 

 others should be bent or drawn out to a fine point, and 

 made either of the shapes represented. 



FIG. 128. 



A. Trough for showing Circulation in Fisli-tail. 



B. Collecting-bottle and Stick. 



Fig. 128, at B, is represented a convenient and port- 

 able " Collecting-bottle and Stick ;" an ordinary cane 

 divided by a screw, or socket-joint, into two parts for 

 the convenience of packing, and terminated by a brass 

 ring, which is adapted to receive a wide-mouthed 

 bottle. A small fine-gauze net and a hook can be 

 screwed into the same stock, and the whole packed into 

 a small compass. 



Fio. 129. Net for collecting Minute Animals. 



Compressorium. The purpose of this accessory is to 

 apply a gradual pressure to objects whose structure can 

 only be made out when they are pressed or thinned out 

 by extension. The general plan of the compressorium 

 is shown in fig. 130. 



Boss's Compressorium consists of a stout plate of 

 brass A, about three inches long, having in its centre a 



