From:
Sir John Herschel
To:
John Herschel (son)
Date:
[8 July 1868]
Source of text:
JHS 6.48
Summary:
Comments on son John's spectroscopic and telescopic observations, and encourages observing a particular nebula, as it has been reported as having changed shape since JH observed it in the 1830's.
Contributor:
John Herschel Project