CLASSIFICATION OF ANATOMICAL ABNORMALITIES. 45 
If the latter, then we must look upon them as showing a 
tendency towards a more primitive type, being, as it were, 
an occasional reproduction of some ancestral feature. 
Believing this to be so, we are fully justified in regarding 
them as indications of descent from the lower animals; 
and we may consider every reversive abnormality as but 
an additional weight in the scale in favour of the great 
theory of evolution. 
