human
That changes of structure caused by changes of action must be transmitted, however obscurely, appears to be a deduction from first principles--or if not a specific deduction, still, a general implication. For if an organism A, has, by any peculiar habit or condition of life, been modified into the form A', it follows that all the functions of A', reproductive function included, must be in some degree different from the functions of A. [This, we venture to think, must depend on the nature and amount of the modification.]
gpt
An organism being a combination of rhythmically-acting parts in moving equilibrium, the action and structure of any one part cannot be altered without causing alterations of action and structure in all the rest. [The appreciability of the change will depend on the amount and nature of the modification, and on the intimacy of the correlation subsisting in the organism. Dislodging a rock may alter the centre of gravity of the earth, but it does not do so appreciably.]
human
And if the organism A, when changed to A', must be changed in all its functions; then the offspring of A' cannot be the same as they would have been had it retained the form A. [Assuming that is to say that the change in the physiological units of the body affects the physiological units in the germ-cells.]
gpt
That the change in the offspring must, other things equal, be in the same direction as the change in the parent, appears implied by the fact that the change propagated throughout the parental system is a change towards a new state of equilibrium--a change tending to bring the actions of all organs, reproductive included, into harmony with these new actions.