68 GUIDE TO THE STUDY OF LICHENS. 



be glued in a scrap-book or a blank book of a similar 

 nature. In this case it is advised to follow some system ; 

 that is, place the specimens belonging to the same genus 

 on successive pages and arrange the genera in the order 

 they are given in the guide. If one scrap-book is filled, 

 get another of the same kind and proceed as before. 

 For the amateur the scrap-book method will prove 

 most satisfactory ; but if it is intended to accumulate 

 an extensive or approximately complete collection, it 

 is advisable to use the mounting sheets. 



The specimens may also be glued on small pieces of 

 heavy paper (bristol-board will answer very well). 

 / ' Later these sheets with the specimens may be glued 

 on the regulation mounting paper, or in the scrap-book. 

 In all instances space should be left to paste the label 

 at the lower right-hand corner, 



Crustose bark-lichens and the smaller specimens of 

 crustose rock-lichens may be mounted at once. Re- 

 move unnecessary bark and rock, and make them as 

 presentable as possible before mounting. Usually, 

 rock-specimens are too heavy to be mounted on paper; 

 they had best be kept in small pasteboard boxes, or 

 in the paper pockets about to be described. In any 

 case it is not at all likely that the beginner will care 

 to make an extensive collection of rock-specimens. 



Lichens may also be put up in paper pockets, especially 

 those intended for exchange. A paper pocket is noth- 

 ing more or less than a piece of heavy paper (manila 

 or similar paper) folded in such a manner as to hold 

 the specimen. They may be made as follows : Secure 

 the right sort of paper, and cut or have it cut into 



