106 CARD CATALOGUES AND THEIR APPLICATIONS. 
Example 9 shows a slip thus filled up. 
EHaample 9 :— 
Tyninghame, E. Lothian, 
Luffness House, 
Carpenter & Evans, ’97 19 (41.44) : 54.4. 
Epeira umbratica. a 
After an excursion of the Society, or after the holidays 
of an individual member, a number of these slips would be 
handed to the official in charge of the catalogue, who would 
file them in their proper places. 
The catalogue would soon come to contain an immense 
mass of valuable information ready for immediate use and 
easy of access. z 
In addition to cards for genera and species, others can be 
provided for general topics, which members may be studying, 
such as commensalism; or a set of guides can be arranged 
geographically, and names of species found there filed between 
them. The systematic catalogue of genera and species is, 
however, the backbone of the whole work, and other 
developments may be added subsequently as occasion 
arises. 
