18. 



genera in the family, if not, the other side may be used also. 

 This, too, may be recommended for use as a marker for the 

 larger genera, in which case the list of species may be printed 

 upon it. Such a list is always in position Tor consulting. 



In all large herbariums there is supposed to be a species 

 cover for each species. This is made of a medium grade of 

 manila paper cut to a size of i6f by 26 inches and folded once. 

 In this the sheets of mounted specimens fit Hke leaves in a 

 book. At the beginning of each genus a slightly heavier cover 

 of the same size and material, called a genus cover, should be 

 placed. This is to contain species that are not yet placed in 

 species sheets, whether for lack of time, or because they have 

 not been satisfactorily identified. In the lower left-hand 

 corner the name of the genus should be written and the same 

 place on the species cover should contain the name of the 

 species. 



It is customary to place several genus covers at the end 

 of the genus, in which to place foreign material. When the 

 collections are large it is difficult tO' distinguish between these 

 ^lain covers, therefore various color-schemes for making the 

 task easier have been suggested. The Field Columbian Mu- 

 seum uses colored manila covers for its foreign specimens, but 

 the trouble of obtaining and keeping in stock a supply of the 

 colors needed may prevent many from adopting this scheme. 

 A less expensive method, which gives equally good results, is 

 to have a number of slips 3 by 4 inches in size cut from thin 

 paper of the desired color. These may be pasted to the lower 

 left-hand corner of the ordinary genus cover, and has the ad- 

 vantage over entire-colored covers, in that the color can be 

 changed at will by pasting a second slip over the first. 



If colors are used to mark the different countries, they 

 should be used in the order following: For North America, 

 plain manila ; South America, red ; Europe, blue ; Asia, orange ; 

 y\frica, green ; Australia and Polynesia, yellow. 



In conclusion it may be said that an herbarium made after 

 the directions herein given will continue to increase in value 

 with age, and instead of being thrown away as so much rub- 

 bish when the owner is done with it, will find many others 

 glad to preserve it. 



