Darwin himself felt a great difference in looking at variation as an evolutionist and as a systematist.
This is convenient for the systematist, but embarrassing for the naturalist.
For over a century this species has been the plaything of the systematist.
There it is preserved, a monument of Lindley's skill and industry and of inestimable value to the systematist.
It would be an interesting study to compare Cuvier's views on variation with those of Darwin, who was essentially a systematist.
From the above brief account it may perhaps be concluded that Berkeley was essentially a systematist and founder of new species.
In weasels, change in color of the pelage is the seasonal variation most important for the systematist to understand.
Whenever a systematist comes across an Asiatic bird of which he can make nothing, he classes it among the Crateropodidæ.
But for the systematist the difficulty is by the establishment of this group only doubled.
The systematist gets on very well with hair as his differentia until the question of development is raised.