Aristotle's definition of fortitude for the benefit of his gallant lieutenant, and argues elaborately to dissuade him from a practice which he believes to prevail in 'the king's shipps, when, in desperate cases, they blow up the same.' He proves by most excellent reasons, and by the authority of Plutarch, that such self-immolation is an unnecessary strain of gallantry; yet somehow we feel rather glad that Sir Thomas could not be a witness to the reception of this sensible, but perhaps rather superfluous, advice, in the messroom of the 'Marie Rose.' It is more pleasant to observe the carefulness with which he has treasured up and repeats all the compliments to the lieutenant's valour and wisdom which have reached him from trustworthy sources. This son appears to have died at a comparatively early age; but with the elder son, Edward--who, like his father, travelled in various parts of Europe, and then became a distinguished physician--he maintained a long correspondence, full of those curious details in which his soul delighted. His son, for example, writes from Prague that 'in the mines at Brunswick is reported to be a spirit; and another at the tin mine at Stackenwald, in the shape of a monke, which strikes the miners, playeth on the bagpipe, and many such tricks.' They correspond, however, on more legitimate inquiries, and especially on the points to be noticed in the son's medical lectures. Sir Thomas takes a keen interest in the fate of an unlucky 'oestridge' which found its way to London in 1681, and was doomed to illustrate some of the vulgar errors. The poor bird was induced to swallow a piece of iron weighing two and a-half ounces, which, strange to say, it could not digest. It soon afterwards died 'of a soden,' either from the severity of the weather or from the peculiar nature of its diet. In one well-known case Sir Thomas's peculiar theories received a more unfortunate application; he contributed by his evidence to the death of the witches tried by Hale in 1664; and one could wish that in this case his love of the wonderful had been more checked by his sense of humour.