Before proceeding to give our readers some idea of the mode in which Sir David Brewster encounters Dr Whewell, let us offer a general observation concerning both these eminent gentlemen. While the latter exhibits throughout his Essay a spirit of candour and modesty, without one harsh expression or uncharitable insinuation with reference to the holder of doctrines which he is bent upon impugning with all his mental power and multifarious resources; the former, as we have seen, uses language at once heated, uncourteous, and unjustifiable: especially where he more than insinuates that his opponent, whose great knowledge and ability he admits, either deliberately countenances doctrines tending really to Atheism, or may be believed “_ignorant_ of their tendency, and to have forgotten the truths of Inspiration, and even those of Natural Religion.”[47] To venture, however circuitously, to hint such imputations upon an opponent whom he had the slightest reason to suspect being one of such high and responsible academic position, is an offence equally against personal courtesy and public propriety; as we think Sir David Brewster would, on reflection, acknowledge. Both Dr Whewell and Sir David Brewster must excuse us, if, scanning both through the cold medium of impartial criticism, their speculations, questions, or assertions appear to us disturbed and deflected by a leading prepossession or foregone conclusion, which we shall indicate in the words of each. Dr WHEWELL.—“The Earth is really the largest Planetary body in the Solar system; its domestic hearth, and the Only World [_i. e._ collection of intelligent creatures] in the Universe.”[48] Sir DAVID BREWSTER.—“Life is almost a property of matter.... Wherever there is Matter, there must be Life:—Life physical, to enjoy its beauties; Life Moral, to worship its Maker; and Life Intellectual, to proclaim His wisdom and His power.... Universal Life upon Universal matter, is an idea to which the mind instinctively clings.... Every star in the Heavens, and every point in a nebula which the most powerful telescope has not separated from its neighbour, is a sun surrounded by inhabited planets like our own.... In peopling such worlds with life and intelligence, we assign the cause of their existence; and when the mind is once alive to this great Truth, it cannot fail to realise the grand combination of infinity of life with infinity of matter.”[49]