the assertor and vindicator of the Hunterian Theory a congenial intellect, and a disciple in whom Hunter himself would have exulted. Would that this attempt had been made on a larger scale, that the writer to whom I refer(1) had in consequence developed his opinions systematically, and carried them yet further back, even to their ultimate principle! But this the scientific world has yet to expect; or it is more than probable that the present humble endeavour would have been superseded, or confined, at least, to the task of restating the opinion of my predecessor with such modifications as the differences that will always exist between men who have thought independently, and each for himself, have never failed to introduce, even on problems of far easier and more obvious solution. Without further preface or apology, therefore, I shall state at once my objections to all the definitions that have hitherto been given of Life, as meaning too much or too little, with an exception, however, in favour of those which mean nothing at all; and even these last must, in certain cases, receive an honour they do not merit, and be confuted, or rather detected, on account of their too general acceptance, and the incalculable power of words over the minds of men in proportion to the remoteness of the subject from the cognizance of the senses. It would be equally presumptuous and unreasonable should I, with a late writer on this subject, “exhort the reader to be particularly on his guard against loose and indefinite expressions;” but I perfectly agree that they are the bane of all science, and have been remarkably injurious in the different departments of physiology. THE NATURE OF LIFE. On The Definitions Of Life Hitherto Received. Hints Towards A More Comprehensive Theory.