Berkeley (George) A Treatise concerning the Principles of Human Knowledge. Part I [all published], first edition, title within double rule border with faint pencil signature of Baker at head, ink signature of L.G.Baker to head of p.51 and two manuscript alterations/additions to p.61, lacking final blank leaf, rather soiled and stained, G2 & 3 a little frayed at lower edge, K1 lacking upper outer corner with slight loss to pagination, later half dark blue roan, spine gilt, rubbed, corners a little worn, [Keynes 5; PMM 176], 8vo, Dublin, by Aaron Rhames, for Jeremy Pepyat, 1710.*** Rare. Berkeley's most important philosophical work, in which he "maintained that no existence is conceivable or possible which is not conscious spirit or the ideas of which such a spirit is conscious. This presupposes complete equation of subject and object: no object can exist without a Mind to conceive it". (PMM).The manuscript alterations/additions to p.61 are as follows: line 11 "should" is altered to "might" and in line 14 "without the help of external Bodies" is inserted after "Intelligence", the whole reading, "Suppose, what no one can deny possible, an Intelligence without the help of external Bodies to be affected with the same train of Sensations or Ideas that you are, imprinted in the same order and with like vividness in his Mind."