From this point of view it is not sufficient, in attempting to map out the earths surface into regions of vegetation, to have regard alone to adaptations to physical conditions.
In the attempt that has been made to map out the land surface of the earth, probable community of origin has been relied upon more than the possession of obvious characters.
The distribution of fossils frequently makes it possible to map out approximately the general features of land and sea in long-past geological periods, and so to enable the history of crustal relief to be traced.'
The direction of the induction is also of course indicated by the direction of the lines, which thus serve to map out space in a convenient manner.
There is discernible in his essays no attempt to map out a complete plan, and then to fill up its outlines.