This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1847 edition. Excerpt: ... The following Correspondence Is given full mul unaltered. The words in Italic are such as stood underlined In the original; and any insertion is marked by an mclusure within square brackets. correspondence between professor de morgan and sir william hamilton. From Professor De Morgan. Sir, --1. With proper apology for intruding a stranger's inquiries upon you, I beg leave to ask a question, which, I judge from your writings, no one in this country is so likely to answer. Having been recently engaged in an examination of the Aristotelian syllogism, which has led to results which I intend to publish, n.b. and which certainly are not to be found mentioned in, it may be, a couple of dozen of works on formal logic which I have examined, from the invention of printing till now;--I am impeded by the absence of all history of the syllogism, its form and fabric, from the works which have fallen in my way on the history of philosophy. Can you inform me whether there exists such a history to any greater amount, for example, than is prefixed to the older editions of Aldrich, which amounts to very little? If you can indicate any line of books in which what I want may be found, or any one book which deals in authorities, you will confer a great obligation upon me, --I remain, Sir, yonr obedient servant, A. de mobgan. University College, London, December September 30, 1846. ii. From Sir William Hamilton.. Aberdour, Fifeshire, 7th Oct. 1846. 2. Sir, --I have to apologise for the delay in answering yonr letter of the 30th September, which, in consequence of being absent from Edinburgh, did not reach me till yesterday. In reference to your inquiry about the history of the Aris