162 MOSSES AND LIVERWORTS 



correspondence with the " Census Catalogue," as 

 here can be entered a short note of the plants 

 that are met with in different localities, but which 

 are not mounted. I have yet another Register, 

 which, though by no means a necessity, has 

 nevertheless proved fertile in suggestions; this 

 consists of a small book in which are recorded, 

 opposite to the corresponding numbers of the 

 slides, the media used in mounting and sealing, 

 and the dates when these respective operations 

 were performed, so that, if any particular slide 

 should go wrong and alas ! this will sometimes 

 happen in the best-regulated collection it is easy 

 to see from this book the general details of both 

 mounting and sealing. Thus a hint may not 

 unfrequently be gathered as to what to avoid in 

 future ; and, moreover, a glance at the Register will 

 often tell whether it is advisable to add another 

 coat of varnish round the margins of the cells. 



It may be useful to add, in this connection, 

 that dried specimens are best preserved in paper 

 packets, on the outside of which should be noted 

 the name, and date and place of gathering, as 

 also any other information, such as the name of 

 the collector, etc. These packets may conveniently 

 be gummed onto sheets of stout paper, 16^ in. by 

 10 in., each one of which bears at its lower left- 

 hand corner the name of the genus and species, 

 and at its upper right-hand corner the correspond- 

 ing number in the Catalogue. 



