CORRESPONDANCE. l6j70. 9 fent. This morning Signor Caffini gave raee the honour of a vifitt; his health (God bee thanked) is flouril hing & now hee intends to reaflume his obfervations to which the unkindnefle of the Weather made a very fharpe refiftance. Particularly this Eclypfe 12 ) in March hee intends raoft particularly to obferve butt here hee fup- pofeth it will bee fraall, & leffe difcernable then with you in England, & yet lelTe then which Monfieur Gregorie 13 ) in Scotland to whoml write to intreat the concur rence of his obfervation to the end that, by comparing, the truth may better come too bee regulated : the famé favour hee defires from your Academifts in England the exaftnefle of whofe obfervations hee hopes will extreamly contribute to the correéting of his. In the meane time hisEphemerides 14 ) lie not dormant, butt with- in a moneths time hee told mee hee hoped to have them publifht : as for his other invention about Apogees & excentricities I3 ), that will not bee digefted foe fud- dainly for hee tells mee it dépends upon the orders & déterminations of Monfieur Golbert upon whom ail the motions of the Royal Académie are to bee calculated; tor the meafure of their times are fett by him. Monfieur Huygens ,5 ) On Saturday laftFebruary aath about 11 of the clock in the morning there came one from Monfieur Huygens to mee who told mee if it werc my convenience that Monfieur Huygens defired to fpeake with mee. I made anfwer that I had feverall times becnc to waite upon him fince I had leard of his fickneflc butt becaufe the Porter at the gâte had told mee that his ic tnelTe was very violent & that his Phyfitians had ordered him reft & that hee po te with nobody, for that reafon I had abftaind butt that I fhould not faile in ne atternoone to waite upon him. At thiee a clock I came thither, I found him a bed his head rayfed very high on y i s fervant in the Roome. After I had made my firll compliment & was ett c owne by his bed fide his fervant hee commandcd to retire & when wee were one îee turned to mee & having begun with a préfacé of civility, which expresft ore e eeme & affeftion then I could deferve, hee faid, I faw the condition hee was m which was none of the mofl lively, that his weaknefle & paleneflTe did fuffi- ciently déclaré how great a deftruftion his fickncffe had wrought in his health & vigour & that though ail was bad, which I faw, yet there was fomething worfe ^ Gette éclipse de soleil eut lieu le 19 avril 1670. I3 ) L’auteur désigne James Gregory. ) Les éphémérides des satellites de Jupiter. Les premières éphémérides furent publiées à Bo logne , en 1668 , sous le titre : J. D, Calfini. Ephemerides Mediceorum Syderum ex Hypothefibus & Tabulis Joan. Domi- nici Caffini Bononiae. in-f°. Cassini publia ensuite, en 1693 , Les Ilypotheses et les Tables des Satellites de Jupiter, Réformées sur de nouvelles Observations. Mémoires de l’Académie R °yale des Sciences, depuis 1666 jusqu’à 1699, Tome VIII, page 317. ) Nouvelle Maniéré Géométrique et direéte de trouver les Apogées, les Excentricités, et les Ano- m aliesdu mouvement des Planètes. Par J. D. Cassini. Journal des Scavants du 2 septembre 1669. ) Ici suivent dans l’original quelques lignes biffées par Oldenburg de manière à rendre les mots illisibles. Œuvres. T. VII.