Cambridge. July 6 1904
  Clear & warm with almost no wind.
  Spent most of day in Museum writing
letters etc. Our Cat birds have successfully reared
& launched their first brood. Young Robins, Yellow
Warblers, Chippies, Redstarts & Grosbeaks are also
flying about the Garden. saw one or two Swifts
at evening. A pair of Yellow bill Cuckoos built their
nest in a pear three but no young have been apparent. I
heard the old birds to-day.