Alfred Newton and Peter Chalmers Mitchell, 1911 Encyclopædia Britannica (1911)
“ Classification for the first time was something more than the expression of a fancy, not that it had not also its imaginative side. Men's minds began to figure to themselves the original type of some well-marked genus or family of birds. They could even discern dimly some generalized stock whence had descended whole groups that now differed strangely in habits and appearance—their discernment aided, may be, by some isolated form which yet retained undeniable traces of a primitive structure. More dimly still visions of what the first bird may have been like could be reasonably entertained ”
