I893-J 67 [Hyatt. 
action of these whether occurring in the single nietazoon or colo- 
nies of nietazoons or the autoteranon (single protozoon or tissue 
cell) or in the organic cycles of these organisms. 
When one passes beyond tliis ami attempts to deal with the 
characteristics of ontogeny, he at once finds himself in the presence 
of other forces, such as heredity and other processes, namely, the 
acquisition of new characters and the renewal of the powers of 
nuclear substance by means of conjugation, whether this occurs 
between agamic autotemnons as stated by some authorities or 
between those that may be distinguished as gamic by their supposed 
sexual differences, or Ijetween true zoons that are known to be 
sexually distinct. 
The laws of growth, in other words, deal with all tlie problems 
that flow directly from the union of the two factors, suitable food 
and a living organism, and the form of energy generated in this 
way. 
Genesiology ou Heredity. 
The term heredity has been used in two senses, one express- 
ing the results of the action of an unknown force which guides 
the genesis of one organism from another, and a second in which 
it implies the force itself. C. Herbert Hurst^ has pointed out the 
confusion of ideas which prevails in the usage of this term in 
his "Evolution of heredity," and I quote from him the follow- 
ing: "The schools of Pangenesis and of Continuity [Weismann- 
ian] alike regard heredity' as the original and normal course of 
events, and variation as a secondary and abnormal occurrence 
brought about by the fortuitous interference of some extraneous 
influence. Even modern text-books speak of 'heredity' and 'vari- 
ability' as if they were concrete entities capable of producing 
effects. One would laugh at the philosopher who sought to 
explain the turning of a weather-cock to the south-east on a 
particular occasion by referring it to the bursting into activity of 
a long-latent tendency to turn to the south-east. The 'ten- 
dency to vary' and the 'phylogenetic force' of some writers, 
the 'force of heredity' and 'force of variability' of others, are 
1 Natural science, t, 1, p. 579, October, 1892. 
