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De Morgan, Augustus in correspondent 
1850-1859::1850::01 in date 
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Herschel7007

From:
Sir John Herschel
To:
Augustus De Morgan
Date:
1850-1
Source of text:
RS:HS 23.80
Summary:

Comments on calculation by Frédéric Petit of the hyperbolic orbit of the meteor of 19 Aug. 1847.

Contributor:
John Herschel Project

Herschel7004

From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[21 January 1850]
Source of text:
RS:HS 6.256
Summary:

Regarding the delicate case of priority of investigation. Quotes example of Henry Warburton and John Brinkley.

Contributor:
John Herschel Project

Herschel7005

From:
Sir John Herschel
To:
Augustus De Morgan
Date:
[24 January 1850]
Source of text:
RS:HS 23.81
Summary:

About Henry Warburton's theorem, and the Gregorian calendar.

Contributor:
John Herschel Project

Herschel7006

From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[25 January 1850]
Source of text:
RS:HS 6.257
Summary:

Further regarding the Gregorian calendar and comments on some of the questions involved in its interpretation.

Contributor:
John Herschel Project
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