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Document number: 5823
Date: 11 May 1849
Dating: date? indistinct
Recipient: TALBOT William Henry Fox
Author: KELLAND Philip
Collection: British Library, London, Manuscripts - Fox Talbot Collection
Last updated: 1st September 2003

May 11 1849

My dear Sir,

I have transmitted your additions to Mess Balfour for printing.

I have given in the papers themselves on Friday last. You will probably have to <assess?> in what form the addition to the paper on parallels should be made. I have sent it with the paper to Messr Balfour –

The ordinary Demonstration of your last property would run thus

<0?n> = au/b<n?> + bu/y<n?> by the well known theorem differential: & a3:b3::n<?>:y<?>

<Joquanis?> points but this does let θ without further differentiation distinguish whether the <term?> is a max or a minm (Tho’ the nature of the case determines it) does your demonstration?

I am faily

Philip Kelland

H. F. Talbot Esq

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