676 MANUAL OF NATURAL HISTORY. 



the outer edge of the mouth, and which we have here 



figured. Inside the mouth 

 of the bottle is a rim of 

 cork about an inch in 

 depth, and an eighth of 

 an inch in thickness, into 

 which is inserted a stout, 

 solid, plug - shaped glass 

 stopper, the top of which 



is flattened and made of 



~*- *" 



exactly the same diameter 



as the neck of the bottle. This, when put well in, is 

 kept tight by means of the cork-rim, yet not so much 

 as to prevent its being easily extracted. When full 

 they may be covered over with moistened bladder, 

 or better, by putting on a slip of thin sheet Vulcan- 

 ized India-rubber, which is made to adhere hy the 

 previous application of a little " Caoutchouc-varnish" 

 along the edges, and further secured by a piece of 

 twine. Bottles of this construction could be made 

 with the mouths of any convenient size, and would 

 form excellent travelling companions. 



1 6. A quantity of 'twine, some thread, and & pocket 

 measuring -tape. 



1*7. One or two pairs of scissors. 



18. When it is intended to transmit living plants 

 Ward's plant-cases, which are simply miniature 

 green-houses, must be procured. 



General Directions for Dry Specimens. 

 1. Selection of Specimens, &c. Whenever it is pos- 



