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causes and effects of the great operations of the heavensand the winds. In a place sheltered from the winds,those who are in health preserve it, those who are illsoon recover, though in other, even healthy places,they would require different treatment, and this entirelyon account of their shelter from the winds. The dis-orders difficult to cure in exposed situations are colds,the gout, coughs, phthisis, pleurisy, spitting of blood,and those diseases which are treated by replenishmentinstead of exhaustion of the natural forces. Such dis-orders are cured with difficulty. First, because they arethe effect of cold; secondly, because the strength of the-patient being greatly diminished by the disorder, the airagitated by the action of the winds becomes poor andexhausts the body’s moisture, tending to make it lowand feeble; whereas, that air which from its soft andthick nature is not liable to great agitation, nourishesand refreshes its strength. According to some, thereare but four winds, namely, Solanus, the east wind,Auster, the south wind, Favonius, the west wind, andSeptentrio, the north wind. But those who are morecurious in these matters reckon eight winds; amongsuch was Andronicus Cyrrhestes, who, to exemplify thetheory, built at Athens an octagonal marble tower, oneach side of which was sculptured a figure representingthe wind blowing from the quarter opposite thereto.On the top of the roof of this tower a brazen Tritonwith a rod in his right hand moved on a pivot, andpointed to the figure of the quarter in which the windlay. The other winds not above named are Eurus, thesouth-east wind, Africus, the south-west wind, Caurus,by many called Corus, the north-west wind, and Aquilothe north-east wind. Thus are expressed the numberand names of the winds and the points whence theyblow. To find and lay down their situation we pro-ceed as follows : let a marble slab be fixed level inthe centre of the space enclosed by the walls, or let