VOL. XLV.] PHILOSOPHICAL TRANSACTIONS. 527 



coction commonly used in its preparation, is rendered less fit for preserving fish, 

 flesh, and other provisions, than it would be if prepared with a more gentle heat. 

 — Lemma A. The heterogeneous substances which are commonly mixed with 

 white salt, render it less proper for preserving provisions, than it would be if se- 

 parated from them. 



After having fully considered the foregoing, our author gives a method of pre- 

 paring a kind of white salt proper for curing fish, flesh, and other provisions : 

 also a method of refining salt. Most of the facts referred to in these disquisitions 

 are such, as the constant practice of those who make salt sufliciently warrants 

 us to rely on for true and certain ; or else, they are the observations of judicious 

 salt officers, daily conversant in these matters, or of curious and inquisitive na- 

 vigators, merchants, travellers, and naturalists; or, lastly, the experiments of 

 many learned physicians, chemists, and philosophers: the truth of which several 

 facts, though many of them have long been published, has never been called in 

 question. So that these observations and experiments may probably be more 

 relied on by the public, than if they had only been made by our author : since 

 they have the testimony of many skilful and unprejudiced persons, who could 

 have no notion of the uses to which they have been here applied. If therefore 

 the arguments founded on those facts should be esteemed any ways reasonable 

 and satisfactory, the author presumes to remark, that it might not be unworthy 

 the wisdom of the British legislature to direct a more full inquirj' to be made 

 into a matter of this importance, and to order proper works to be erected for 

 making bay-salt, and for making and refining white salt, and to put those works 

 under the management of able and judicious persons, to make exact and accu- 

 rate trials, in order to discover the best and cheapest methods of doing them. 

 And the methods which should be most approved of, might for the general good 

 be made public, and established by law as a common standard, to which all 

 those who make salt in the British dominions should be obliged to conform. 



A Catalogue of the Immersions and Emersions of the Satellites of Jupiter, that 

 will happen in the Year 17-^0; of which there are 173 of the First, 83 of the 

 Second, QA of the Third, and none of the Fourth, hy Reason of its great La- 

 titude ; in all 311. Computed to the Meridian of London from the Flamstee- 

 dian Tables. Corrected by James Hodgson, F. R. S., &c. N" 487, p. 373. 

 These eclipses of Jupiter's satellites, with several former collections by the 



same gentleman, like an old almanac, are now of no further use, after their aera 



is passed. 



