With respect to bodily conformation, he was of a stature rather below the ordinary standard, as has been the case with several very ambitious, active, and successful men. His temperament was the sanguineous, with a proportion of the nervous; whence he was lively, excitable, full of hope, and of great ardour; but since he was in no degree melancholic, some physiologists might puzzle themselves to discover where he obtained his indefatigable industry, his perseverance, his obstinate straightforwardness, and the tenacity with which he held all opinions which he had once received. In youth and middle age he was light, but muscular; whence his personal agility and energy; but as he advanced in years he became rather full, although with little diminution of his corporeal, and still less of his mental activity. In walking he stooped a little, having contracted that habit from his constant search for plants and other objects. He was moderate in his diet, regulated his mode of living by strict method, and by temperance preserved his energies, that he might devote them to the cultivation of his favourite sciences. His hours of sleep were in summer from ten to five, in winter from nine to six. Punctual and orderly in all his arrangements, he underwent labours which to most men would have been impracticable. Yet the period of study he always limited by the natural flow of his spirits, and whenever he became fatigued, or felt indisposed for labour, he laid aside his task. Some persons have accounted for the immense extent of his works by simply allowing him industry and perseverance; but they who think so are not aware, that these qualities are generally inseparable from genius of the highest order. In the evenings he frequently indulged in social intercourse with his friends, when he gave free vent to his lively humour; never for a moment enveloping himself in that reserve with which men of little minds conceal their real want of dignity. Whether delivering a solemn oration at the university, or familiarly conversing with the learned, or dancing in a barn with his pupils, he was respected and esteemed alike. It is perhaps strange that, although of this joyous temperament, he had not a musical ear, having been in this respect like a man whose character was in almost every point very different, but not less truly estimable,--that great master of moral wisdom, Dr Johnson. It would even seem that he had a kind of antipathy to certain combinations of harmonious sound, although it is clear that he enjoyed the lively song of the thrush and skylark, which he mentions in his Lapland journey as affording him delight.