this general doctrine, see
19
In ordinary speech Development is often used as synonymous with Growth. It hence seems needful to say that Development as here and hereafter used, means
20
This paragraph originally formed part of a review-article on "Transcendental Physiology," published in 1857.
21
When, in 1863, the preceding chapter was written, it had not occurred to me that there needed an accompanying chapter treating of Structure. The gap left by that oversight I now fill up. In doing this there have been included certain statements which are tacitly presupposed in the last chapter, and there may also be some which overlap statements in the next chapter. I have not thought it needful so to alter adjacent chapters as to remove these slight defects: the duplicated ideas will bear re-emphasizing.