70 GUIDE TO THE STUDY OF LICHENS. 



sheet or pocket ; even if the name of the specimen is 

 not known, do not fail to give the other data. 



In conclusion, the following general advice may be 

 found useful. Put up only good large specimens ; 

 scrawny, small specimens are not desirable unless 

 they are the only kind obtainable in the locality. 

 Mount a goodly number of duplicate specimens for the 

 purpose of making exchanges. Make your exchanges 

 with a view to mutual gain ; to do this, it is necessary 

 to make exchanges with parties in widely different 

 localities ; state what you have and ask for what you 

 would like in exchange. 



For mounting sheets, driers, labels, vasculums, in 

 fact anything desirable in a botanical line, enter into 

 communication with some dealer in botanical supplies. 

 Purchase only what is needed ; use home material as 

 much as possible. 



