COLLECTION OP SPECIMENS 161 



columns, headed respectively, '* Number," " Date 

 when gathered," "Habitat, etc.," "Remarks." 

 The label on the slide, in addition to briefly re- 

 cording the name and the place and date of 

 gathering, bears the number corresponding with 

 the entry in the Register. 



I have also a copy of the " Census Catalogue of 

 British Mosses " (compiled in 1907, under the 

 auspices of the Moss Exchange Club), which has 

 been interleaved and bound, the numbers of the 

 various species in the Catalogue being repeated 

 on the interleaved pages. Opposite to each 

 number I put the numbers of the slides that I 

 possess of the particular species. Thus, Mhium 

 stellare is numbered 441 in the Catalogue, and 

 against this number I find entered 271, 282, and 

 1,266, which gives me the reference to the three 

 slides of this moss in my collection. By the help 

 of the latter register I can always find the slides 

 representing any special moss, and the general 

 Register will give me the details of place and 

 date where and when it was gathered, together 

 with any observations that may have been made 

 with regard to it, as, for instance, my authority 

 for its name. And, as the slides are placed in 

 the drawers in numerical order, the necessity for 

 leaving blank spaces for species not yet acquired 

 does not arise. It is useful to have a third 

 register, ruled with two or three columns to a 

 page, the columns being numbered and named in 



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