RETROGRESS • E-FREE TRANSLATION.COM • Definition of Retrogress

... other in certain aspects, but which are none the less mutually incompatible and antagonistic. So that the discord between species will go on increasing." "There are species which are arrested, there are some that retrogress. Evolution is not only a movement forward; in many cases we observe a marking-time, and still more often a deviation or turning back. Thence results an increasing disorder. No doubt there is progress, if progress means a continual advance in the general direction determined by a first impulsion; ...

— Bergson and His Philosophy • J. Alexander Gunn