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First, That Englishmen and such others, as are well versed in the English tongue, find no difficulty in understanding the descriptions of these Engines, nor in apprehending their structure, exhibited by the Figures, especially if notice. be, taken of the Emendation, expressed at the end of Num. 10. about the misgraving the Bended end of the Springing Wire (which it seems has not been noted in France, tho' the said Num. 10 is known to have been seen there a pretty while before their Journal of May 24. was publish'd). And as for the particular of the Bucket, fetching water from the bottom of the Sea, both the Figure and the annexed Description thereof are so plain and clear, that tis some wonder here, that any difficulty of understanding them is pretended by any, that hath but ordinary skill in Cutts and the English language. Mean while, that way, which the French Author that recommends for this purpose as more simple, Videl. a Brass-Pump with double Valves, is not at all unknown in England, nor his bin left untried there; but was found inconvenient, in respect that the Valves in descending did not fully open, and give the water a free passage through the Cavity of the Vessel, nor in ascending shut so close, as to hinder the water from coming in at the top: Whereas by the way proposed in Num. 9. both is perfom'd with great ease and security.
Secondly, Whereas the French Author is of opinion, that 'tis unknown, how, much time a Heavy Body requires to sink in water, according to a certain depth; he may please to take notice, that that hath been made out in England by frequent Experiments; by which, several Depths, found by this Method of sounding without a Line, were examin'd by trying them over again in the same place with a Line, after the common way. And as to that Quære of his, Whether a heavy Body descends in the same Proportion of swiftness in Water, that it would do in Air? The Answer is, that it does not; but that, after it is sunk one or two fathoms into the Water, it has there arrived to its greatest swiftness, and keeps, after that, an equal degree of velocity; the Resistance of the water being then found equal to the Endeavour of the heavy Body downwards.
Thirdly, When the same Author alledges that it must be known, when a Light Body reascends from the bottom of the water to
