.\<'<,>risiTION AND PRESERVATION 



hoop is first wound with a narrow strip of the goods, to 

 prevent the wire from wearing- on the cloth. The bag 

 should he two-and-a-quarter times as deep as the diam- 

 eter of the hoop. 



Two bag's may be cut from one width of cloth, if 

 properly managed. The cloth is folded lengthwise; 

 the dotted lines in the accompanying figure show how 

 to cut the net. The seams are then sewed up, and the 

 wide upper part folded over the hoop and stitched down. 

 It is necessary to make the upper part of the same 

 width, in order to prevent its drawing in and decreas- 

 ing the diameter of the opening; so we have shown in 

 the figure a straight cut of two and one-half inches at 

 the mouth of the net. 



It is well to protect the covering of the hoop by a 

 strip of heavy muslin sewed over it, since the rubbing 

 of leaves and stems soon wears out the cloth around the 



wire. 



Preserving Materials. Insects can be preserved in two 



W 7 ays : by placing on pins, or in preserving-fluid, de- 

 pending upon the character of the insect or the purposes 

 to which it is to be put, If the insect is of delicate tex- 

 ture, such as a larva or a nymph, it will shrivel if 

 pinned. Such should be placed in 70% of alcohol or 

 in a two-per-cent. solution of formalin. Insects col- 

 lected for the purpose of dissection should be similarly 

 treated, since the tissues remain soft and are easily 

 worked. In the case of insects for immediate use in 

 dissection, these can be killed in W% solution of chloral 

 hydrate. 



A cigar-box, the bottom being lined with corn or elder 

 15 



