[231]

(231

Sect VI. Summary

laws, Unity of Type & the Conditions of Existence.

[insertion in pencil:] The latter term is descent itself by the former is meant implied the fundamental agreement in relation between organisms of the same class independtly of their means of life.

Unity of type (a) On our theory, Unity of type means & is explained by Unity of descent. The expression of Conditions of Existence, so often insisted on by the illustrious Cuvier, & his great disciple Owen, is is fully embraced in our view of by Natural selection; which either is for natural selection acts by either is now adapting each the varying parts of each organism being to its organic & inorganic conditions of life existence; either both directly or indirectly through correlations of growth or have adapted them or during long-past periods of time, either has directly or indirectly through the laws correlation of growth adapted them to same conditions.   or by having adapted them during long past periods of time; (B) Hence in fact the law of the Conditions of Existence is the highest law, as it includes, through the inheritance of former adaptations, that of Unity of Type.

[insertion in pencil, overwritten:] from former ancient periods of adapted structures

[calculation in pencil:]

21
31
—
52

[231v]

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[there are pin holes where [folio 231](a)(b) was attached here]