172, READINGS IN EVOLUTION, GENETICS, AND EUGENICS 
The fascinating biogenetic Jaw of Miiller and Haeckel summed up 
in the phrase, “‘ontogeny is a recapitulation of phylogeny,’ must not 
be too heavily leaned on as a support for any speculations as to the 
phyletic affinities of any species or group of species of organisms. 
“Embryology is an ancient manuscript with many of the sheets lost, 
others displaced, and with spurious passages interpolated by a later 
hand.” 
