VOL. XL.] FHILOSOPHICAL TRANSACTIONS. 145 



least 18 or 20 years to grow again ; which is directly contrary to what Dr. 

 Oliver says in N" 290 of the Phil. Trans. He added besides, that its fruit is 

 no ways like a chestnut, as the Doctor informs us in the same paper; but rather 

 like a pod, which incloses a seed somewhat like a hop-seed, and that he had 

 sent some of them to England. 



He could not tell by what artifice or stratagem the Jesuits have got this bark 

 to be called after them, if not that they carried it first into Europe, and gave 

 themselves out as the first discoverers of its virtues : but he asserted, that the 

 current opinion at Loxa is, that its qualities and use were known by the Indians 

 before any Spaniards came among them ; and that it was by them applied in the 

 cure of intermitting fevers, which are frequent over all that wet unhealthy 

 country. 



An Account, by Mr. John Eames, F. R. S. of a Booh entitled, A Mathematical 

 Treatise, containing a System of Conic-Sections, with the Doctrine of Fluxions 

 and Fluents, applied to various Subjects. By John Muller. N° 446, p. 87. 



The ingenious author of this work,* observing how much time is necessarily 

 epent, and pains taken, in learning these valuable parts of mathematics, thought 

 it would be very well worth his while to lessen both, which he hopes he has 

 done considerably, in the following treatise. He has divided it into 3 parts, 

 contained in so many books. 



In the first of these, he considers the properties of the 3 sections of a cone, 

 as well in, as out of the cone. And to make this part of the work of more 

 service to the reader, Mr. Muller has not only selected the most considerable 

 properties of these curves, that are to be met with in other writers, both anci- 

 ent and modern; but has added several new ones, which, as he informs us, are 

 inserted in their proper places. And that such gentlemen as are desirous to 

 read Sir Isaac Newton's Principia, but are at a loss for want of a sufficient ac- 

 quaintance with conic-sections, may be the more obliged, he has taken parti- 

 cular care to demonstrate such properties as Sir Isaac presupposes his reader to 

 be acquainted withal. Accordingly, he has prefixed a table of such propositions, 

 informing him as well where they are to be met with in this book, as in Sir 

 Isaac Newton's Principia Mathematica. 



The proofs made use of in his demonstrations, are sometimes algebraical, at 



* He was afterwards, for many years, professor of Fortification and Artillery, in tlie Royal 

 Military Academy, Woolwich, for the use of which, he published several books on those subjects, 

 which are still in great repute, being the best works extant of the kind. 



VOL. VIU. U 



