had prevailed, and the reason that has supervened. The term INTERVAL, by which the duration of rational discourse and conduct is to be estimated, although of sufficiently precise meaning, is yet susceptible of the most extended signification; and we speak with equal correctness when we say the interval of a moment and of a thousand years. The time necessary to comprise a LUCID interval has not, to the best of my belief, been limited by medical writers or legal authorities; it must however comprehend a portion sufficient to satisfy the inquirer, that the individual, whose intellect had been disordered, does not any longer retain any of the symptoms that constituted his malady; and this presumes on the part of the examiner an intimate knowledge of the unfounded prejudices, delusions, or incapacities with which the mind of the party had been affected, and also deliberate and repeated investigations to ascertain that they are wholly effaced. IMBECILITY. THERE is another subject connected in a legal point of view with the nature of the human mind, and with the state of its morbid conditions, on which I respectfully solicit your Lordship's elucidation. In your Lordship's judgment of 1815, on the Portsmouth petition, it is laid down that "from the moment that (meaning this questionable and disputed unsoundness) had been established, down to this moment, it appears to me however to have been at the same time established, that _whatever_ may be the degree of weakness or imbecility of the party,--_whatever_ may be the degree of incapacity of the party to manage his own affairs, if the finding of the jury is only that he was of an extreme imbecility of mind, that he has an inability to manage his own affairs; if they will not proceed to infer from that, in their finding upon oath, that he is of _unsound mind_, they have not established by the result of the inquiry, a case upon which the Chancellor can make a grant, constituting a committee either of the person or estate. All the cases decide that mere imbecility will not do: that an inability to manage a man's affairs will not do, unless that inability and that incapacity to manage his affairs, AMOUNT to evidence that he is of _unsound mind_: and he must be found to be so."