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Letter from John Herschel
Add. MS a/207/1 · Item · 4 Feb. 1817
Parte de Additional Manuscripts a

Slough - WW and George Peacock have 'absolutely turned his [Babbage] brain by your inflammatory conversation'. Babbage has been 'running analysis mad' and so has JH: 'I really have read and written more in the last fortnight than ever I did in twice the time in any other part of my life and I advise you to go and do likewise'. 'The distress of the poor and the pressure of the times forms the subject of conversation here'.

Letter from John Herschel
Add. MS a/207/2 · Item · 18 June 1817
Parte de Additional Manuscripts a

Slough - Baker, [Richard] Gwatkin and Wilkinson have been staying with JH. He is pleased WW is undertaking something definite but wishes it was 'something entirely original. Still I hope your transl. of the application of Geom.y to Alg. will be useful'. WW should give all the forms relative to ellipses of small and large excentricity. A 'compendium of them is a great desiderium'. There 'are divers forms respecting the intersection of strait lines in space which are of the most eminent use in optics which would be valuable'. JH has been working at the demonstration of Stewart's theorems. JH's work on algebra 'goes on steadily but not very rapidly'. Judging by WW's query it does not look as if he is doing much about functions.

Letter from John Herschel
Add. MS a/207/3 · Item · 26 July 1817
Parte de Additional Manuscripts a

JH and Babbage are 'analysing outrageously'. Could WW ask [George] Peacock whether he is making progress in the printing of a work entitled 'A Supplement to Lacroix' which should have been published some months ago.

Letter from John Herschel
Add. MS a/207/4 · Item · 19 Aug. 1818
Parte de Additional Manuscripts a

The Brighton Road - Belated thanks for WW's account of Stevin's [Simon Stevin] investigations about the composition and resolution of forces. JH finds what WW says of Stevin agreeable to what Lagrange says. JH has not been employed in experiments on polarization for some months, and instead has been 'familiarizing myself with the known phenomena, and acquiring that practical habit of experimentation without which it is useless to attempt anything new'. [David] Brewster's discovery of more than one polarising axis in various crystals is a most important discovery, and completely upsets [Jean Baptiste] Biot's division of doubly refracting crystals into attractive and repulsive. JH gives a description of his inquiries and where his experimental observations differ from Brewster's: 'I observed that the phenomenon of the miniature polarised rings which Brewster spoke of in a former paper, was very different in appearance and position from what his description had led me to expect'. Instead 'of one set of ellipses, complete or nearly so seen along the axis, I saw two half sets cut off across their conjugate axes, and equally distant from the axis of the nitre prism'. Brewster places nitre among the class of salts with two axes, and JH has observed three and even contiguous sets of rings.

Letter from John Herschel
Add. MS a/207/5 · Item · 1 Dec. 1819
Parte de Additional Manuscripts a

49 Charlotte St., Portland Pl. - Thanks WW for his Mechanics [An Elementary Treatise on Mechanics, 1819]: WW has made too many 'concessions to the cramming system...and that the work would have been productive of more extensive good...had you conformed a little more to the taste of the age and a little less to that of the University'. JH has recommended WW's application to become a fellow of the Royal Society to Joseph Banks. 'Peacock's pamphlet is singularly stupid' and not worth being made the subject of a paper war. The new rules of the [Cambridge Philosophical] Society 'are very good with I think one exception, that which seems to authorize a system of debating on motions. If this be permitted I cannot conceive the possibility of the Society holding together long or maintaining its respectability'. JH thinks the meetings might receive great additional interest by admitting 2 sorts of communications to be read, one in the form of memoirs, formally got up with a view to publication, and another of a less formal character, containing notices of new facts, sketches of new views, such as give a kind of half publicity by being thus read in public, and thus at once send to secure a claim in case of future discovery, and to excite an interest in the pursuit of truths by railing a kind of philosophical hue and cry'. JH is to read his paper on polarisation to the Royal Society on Thursday: 'The object of the paper is to upset certain overhasty generalisations, a nuisance too common in optical science, and to prove the competency of Biot's theory of periodicity to explain all the phenomena of the polarised rings, which in crystals with 2 axes have hitherto presented anomalies of the most perplexing kind'.

Bill of lading
R./2.40A/14 · Item · 26 Jan. 1820
Parte de Manuscripts in Wren Class R

Venice.—Certifies that R. B. Hoppner, the British Consul, has embarked, on Lord Byron’s account, certain goods aboard the Divina Providenza, bound for Ravenna.

Letter from Charles Babbage
Add. MS a/200/192 · Item · 15 May 1820
Parte de Additional Manuscripts a

Devonshire Rd, Portland Place - Babbage received WW's thirty guineas and has paid 31 for his fees at the Royal Society. Three members of the Astronomical Society have donated 100 guineas toward the Cambridge Observatory (50 came from William Pearson). 'Sir J. B [Joseph Banks] is about to resign and has recommended Davies Gilbert. But all sorts of plans speculations and schemes are afloat, and all sorts of people proper and improper are penetrated with the desire of wielding the sceptre of science. Whether this elective throne shall be filled by a philosopher or peer a priest or prince is a problem pendent on the fortuitous course of events. The Society is in a position of unstable equilibrium or rather it is like a comet which has not made up its mind whether it shall soberly circulate round the light of truth or traverse boundless space through endless time frying and damning the predestined infidels of other systems until some starry giant shall fascinate to its destruction this erring ball which has "run a muck" through creation'.