[简答题] In his autobiography, Darwin himself speaks of his intellectual powers with extraordinary modesty. He points out that he always experienced much difficulty in expressing himself clearly and concisely, but (46)【he believes that this very difficulty may have had the compensating advantage of forcing him to think long and intently about every sentence, and thus enabling him to detect errors in reasoning and in his own observations.】He disclaimed the possession of any great quickness of apprehension or wit, such as distinguished Huxley. (47)【He asserted, also, that his power to follow a long and purely abstract train of thought was very limited, for which reason he felt certain that he never could have succeeded with mathematics.】His memory, too, he described as extensive, but hazy. So poor in one sense was if that he never could remember for more than a few days a single date or a line of poetry. (48)【On the other hand, he did not accept as well founded the charge made by some of his