Item 58 - Letter from Frederick Ryland to Henry Sidgwick

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Thanks Sidgwick for the trouble he has taken, and expresses his gratitude to Mr Jackson also. Reports that since writing to Sidgwick he has come across the [animal rationale] in Porphyrii Isagoge, 'prefixed to Dural's Edition of Aristotle, 1629, vol 1, p.6', and observes that this would probably be 'the first formal statement of the "sacred definition", as Locke calls it.' Asks where he might be able to find the quotation 'Si non vis intelligi, debes negligi', which appears in the 'Essay, III, ix, 10'.