Galen gives the following ingenious explanation why the pulse is contracted and frequent, in cases of acute inflammations. He remarks that, if a person have an inflammation in a limb, he will experience most ease in a state of complete rest; but if obliged, by some urgent necessity, to perform a journey, he will find that he can accomplish this most easily by taking short and frequent steps. In like manner, when any part is inflamed, it would afford most relief if the motion of the arteries could be altogether suspended for a time; but, as this cannot be, nature renders the dilatation as confined as possible, and makes up for its smallness by frequency. (De Usu Respirationis.) SECT. XIII.—ON THE ALVINE DISCHARGES. Of the alvine discharges, the best is that which is soft and compact, and is evacuated at the hour which is customary in health. Such excrement is yellowish, of the proper consistence, and not very fetid; for whatever is different from these is not good. That which resembles in colour the food which has been taken, or is thin, wants the natural juices, and is passed quickly, is indigested. But that which is intensely yellow, if evacuated in the beginning of a disease, indicates that the complaint is of a very bilious nature; but if after the acme, that the body is properly purged. The green is the sign of verdigris-green bile, but the black of black bile, or of adust blood mixed with it. The livid marks a coldness and considerable mortification of the internal parts. The oily is the mark of a melting of the fat in the body; as the glutinous, which is worse than the oily, is a mark of a melting of the parts of the animal. That which is very fetid is a mark of no small degree of putridity. With regard to them all, if the quality of the excrements does not correspond with the food which had been taken, you may thus judge of the affection. Of all kinds, the worst and most fatal is black, livid, oily, and what is hastily passed. * * * * *