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De Morgan, Augustus in correspondent 
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1840-1849 in date 
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From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[5 June 1840]
Source of text:
RS:HS 6.184
Summary:

Possible to purchase 12 postage covers for 11d in the Strand. Points out an apparent error in one of JH's books on sound. How does an open pipe vibrate? Regarding the private character of J. L. Lagrange.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Augustus De Morgan
Date:
[26 June 1840]
Source of text:
RS:HS 22.55
Summary:

Thanks AD for a correction in one of JH's writings; tries to explain the partial echo that occurs when blowing across the end of an open pipe.

Contributor:
John Herschel Project
From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[9 February 1841]
Source of text:
RS:HS 6.185
Summary:

Regarding JH's telescope. Includes a rhyme on it.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Augustus De Morgan
Date:
[31 May 1841]
Source of text:
RS:HS 22.86
Summary:

Thanks AD for his theorems; comments on the value of such abstract speculations.

Contributor:
John Herschel Project
From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[10 October 1841]
Source of text:
RS:HS 6.186
Summary:

Points out an error JH has made concerning J. E. Bode's law. What is the proper notation for the satellites?

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Augustus De Morgan
Date:
[17 November 1842]
Source of text:
RS:HS 22.142
Summary:

Thanks AD for the corrections to JH's writing on astronomy; congratulates AD on his book on differential calculus.

Contributor:
John Herschel Project
From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[22 November 1842]
Source of text:
RS:HS 6.187
Summary:

Thanks for the gift of the book. Thomas Longman is now the editor of Lardner's Cyclopaedia. Latitude of the pole star incorrect in Charles Knight's publications. Regarding truth.

Contributor:
John Herschel Project
From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[30 December 1842]
Source of text:
RS:HS 6.188
Summary:

Thanks for his reductions of Schiller's observations. Many people believe the claims made in the 'Moon Hoax'. Is writing a book on the use of the globes.

Contributor:
John Herschel Project
From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[25 December 1843]
Source of text:
RS:HS 6.189
Summary:

Sending two formulae.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Augustus De Morgan
Date:
[1844 or earlier]
Source of text:
RS:HS 25.14.3
Summary:

Thanks AD for having pointed out an error in one of JH's papers.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Augustus De Morgan
Date:
1844
Source of text:
RS:HS 22.216
Summary:

Government intention to reduce interest in savings banks may well affect JH's benefit society.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Augustus De Morgan
Date:
[29 January 1844]
Source of text:
RS:HS 22.175
Summary:

Wants to set up a benefit club; for mutual insurance of artisans, etc., and is asking AD for actuarial information.

Contributor:
John Herschel Project
From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[30 January 1844]
Source of text:
RS:HS 6.190
Summary:

Regarding the workings of Insurance Companies and Benefit Societies. Recommends an actuary. Hopes JH will come down for the Anniversary meeting.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Augustus De Morgan
Date:
[5 February 1844]
Source of text:
RS:HS 22.176
Summary:

Questions about actuarial information in AD's 1844-1-30.

Contributor:
John Herschel Project
From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[6 February 1844]
Source of text:
RS:HS 6.191
Summary:

Has just had a tract on Friendly Societies from J. W. Woolgar. Answers some queries regarding the work of such societies.

Contributor:
John Herschel Project
From:
Augustus De Morgan
To:
Sir John Herschel
Date:
[10 February 1844]
Source of text:
RS:HS 6.192
Summary:

All the tables in Charles Ansell's work are expressed in decimals. Gives advice on type of insurance for sickness and death. Regarding the true inventor of J. E. Bode's law. Very few at the Anniversary dinner.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Augustus De Morgan
Date:
[18 February 1844]
Source of text:
RS:HS 22.177
Summary:

On poor attendance at R.A.S. dinner, and on the results of unrestricted population growth.

Contributor:
John Herschel Project
From:
Augustus De Morgan
To:
Sir John Herschel
Date:
1844-3
Source of text:
RS:HS 6.193
Summary:

Advice on how to start a Friendly Society. Calculated the sun's pull on the Earth.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Augustus De Morgan
Date:
1844-3
Source of text:
RS:HS 22.178
Summary:

Details of printing the policy for the benefit society.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Augustus De Morgan
Date:
1844-3
Source of text:
RS:HS 22.179
Summary:

More details of the benefit society.

Contributor:
John Herschel Project