Autograph Letter Signed ('Olinthus Gregory') from the English mathematician Olinthus Gilbert Gregory to Knight Spencer, Secretary, Surrey Institution[, regarding a series of lectures by his friend John Mason Good]. With engraved portrait of Gregory.

1p., 4to. Bifolium. Very good, on lightly-aged paper, with slight traces of mount on reverse of second leaf, which is addressed, with three postmarks and docketing by Spencer, to 'Knight Spencer Esq. | Surry [sic] Institution | Blackfriar's Road'. Gregory is pleased to learn 'that there is a probability of Mr. Jones being able to accommodate us with apparatus for our proposed Lectures, upon such terms as are likely to square pretty well with the funds of the Surry Institution'. 'Nothing', he adds, 'can be more pleasant in this subject than a moderate per-centage.' He gives details of when he will be able to call on Jones, after which he will 'take an early opportunity of communicating to [Spencer] the particulars resulting from our interview'. There is no record of Gregory having lectured at the Surrey Institution, but his use of the word 'our' suggests a reference to the series of lectures there on 'The Nature of the Animate World' by his friend John Mason Good. Gregory's 1828 biography of Good describes how Good delivered three series of lectures at the Surrey Institution between 1810 and 1812. The engraved portrait of 'OLINTHUS GREGORY, LL.D. F.R.A.S. &c' is by H. Robinson from a painting by R. Evans, published by Fisher, Son. & Co., London, 1846. In good condition, with spotting to border. Paper dimensions 21 x 27 cm; plate dimensions 15 x 22 cm.