Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
Jim Johnston
1948
Baleen Whale.
4 Aug.
This humping over & submerg-
ing in a vertical plane is
called sounding by the
natives (denizens) of Alaska. The
operation req[uires] 3-4 sec-
onds for the whale to
submerge.