[161]

Nov. 1842.

Talking with Lyell on extinction of Mammalia - Horse. Megatherium was & Mastodon maximus all together & under great bed of recent shells of same proportion species. How like my case. - State of sea not changed. From Arctic circle to Lat. 45° S. From coast of Brazil, highlands & lowland to coast of Pacific & from coast of Atlantic to coast of Pacific in N. America - at elevation of 1000's of feet & in low plains extinction - most wonderful extinction, not caused by man, from autonomy. Chettah, & [illeg] monkey & small opossums - not erratic period from Macrauchenia. Lyell says mango introduced almost Century ago - Lyell says believes recent shells more similar between America & Britain than at any antecedent period - even chalk or Tertiary

[in margin:] Perhaps has some relation to whole worlds' climate may having been affected.