ItdelightsmethatyouareinterestedinwatchingtheprogressofopiniononthechangeofSpecies;Ifearedthatyouwerewearyofthesubject;andthereforedidnotsendA.Gray'sletters.

Please segment the words:
It delights me that you are interested in watching the progress of opinion on the change of Species; I feared that you were weary of the subject; and therefore did not send A. Gray's letters.