']0 JOURNAL OF THE 



the genera of each family according to their serial numbers, and 

 place them between two thick genus covers, opening into each 

 other. Write on the lower left-hand corner of" the package the 

 name and serial number of the natural order, and place around 

 the whole a stout elastic band, or a piece of tape, to keep all 

 snug and tight. 



The packages thus made up, each containing the plants of one 

 natural order only, or, if the order be too extensive, a part of 

 an order, are to be laid away in pasteboard or other kind of 

 boxes of sufficient size to receive the packages without compress- 

 ing. It is best to have the boxes all of uniform depth. Those 

 used in the herbarium of the United States National Museum 

 are 12Jxl8Jx 6J inches. They are of stout pasteboard, cov- 

 ered with black muslin. The cover comes off in the usual way; 

 the front end is hinged at the bottom and falls down wdien the 

 cover is lifted up, exposing tlie labelled ends of the enclosed 

 packages. Each box has a brass ring fastened to the outside of 

 the front end b} means of which it is readily pulled out of its 

 pigeon-hole. Spaces for the name of owner and for the names 

 of the natural orders inclosed are also provided. The names of 

 the genera included may, if desired, be written or pasted on the 

 iyiside of the hinged end. A small piece of naphthaline should 

 be pinned in one corner of the box. The odor of this substance 

 is very disagreeable to insects, and will prevent the female insect 

 from entering to deposit her eggs. The boxes, arranged in regu- 

 lar succession, may be kept on racks, in the cases usually 

 employed, or as suits the fancy ; but so that any one box may 

 be taken out and returned without disturbing the rest. 



