244 WHITMAN CROSS 
The geological map is comparable to a locality index to this 
mass of records. It shows where the records may be found, 
and in a measure the proper chronologic arrangement, the char- 
acter, and the grouping of the works. It is the whole history 
which the compiler of this index must have in mind. If he 
presents merely an index to the lithology of the region, he is 
doing the work of the specialist. Of one thing he may rest 
assured, namely, that his arrangement and his characterization 
of the records will be scrutinized by other students, and if his 
estimate of a given volume is based upon half knowledge, the 
other chapters will be read by more thorough investigators and 
the superficial or limited character of his own work pointed out 
WHITMAN Cross. 
