THE BOTANICAL OUTFIT 39 



is used in the form of pads to equalize pressure 

 round knobby flower-heads (see Chapter 

 VII). 



15. Mounting-papers and Genus-covers, or 

 Albums. Some botanists mount their plants 

 in albums, and there is something to be said for 

 this method. The card leaves are firm and the 

 specimens are protected from shuffling. It is, 

 however, impossible to arrange plants scien- 

 tifically in this way for they must be mounted 

 in the order in which they were found. Pages 

 may be allotted to various Genera and Fam- 

 ilies, but miscalculations are bound to occur. 

 Plants ought to be arranged according to their 

 Families, and if separate mounting-sheets are 

 used this is easily done for all of one Family 

 can be kept together. 



Professional botanists in America have, 

 after long experience, agreed on a standard 

 size for mounting sheets, 111 x 16i inches, and 

 this size will, on the whole, be found most con- 

 venient for a variety of plants. The best 

 paper is a good quality of linen ledger, weigh- 

 ing not less than twenty pounds per ream 

 when cut to the above size. This kind of paper 



