42 



HANDBOOK OF BRITISH MOSSBS. 



then be pinned into the common sheet or sheets which belong 

 to the particular species. It is an excellent plan, whenever 

 a specimen is examined microscopically, to sketch what is seen 

 on the paper to which it is fastened. This precludes the neces- 

 sity of repeated examination, and where specimens are rare 

 prevents their being seriously injured. 



The most convenient power perhaps for examining the 

 leaves of Mosses is a one-third object-glass, while a one-fifth 

 is quite sufficient for the examination of the peristome. 

 Lower powers however will suffice for the determination of 

 genera and species. 



