. Philosophical transactions. pes that thoie who have fixed inllruments may be induced to take anearly opportunity of obferviug them carefully. Feb. I, 1785. A very bright, planetary nebula, about half a minute in diarae*ter, but the edges are not very well defined. It is perfedly round, or perhaps avery little elliptical, and all over of an uniform brightntis : with higher powersit becomes proportionally magnified. It follows y Eridani 16 16 in time, andis 49 more north than that ftar. Feb. 7, 1785. A beautiful, very brilliant globe of light; a little hazy on theedges, but the hazinefs goes o
. Philosophical transactions. pes that thoie who have fixed inllruments may be induced to take anearly opportunity of obferviug them carefully. Feb. I, 1785. A very bright, planetary nebula, about half a minute in diarae*ter, but the edges are not very well defined. It is perfedly round, or perhaps avery little elliptical, and all over of an uniform brightntis : with higher powersit becomes proportionally magnified. It follows y Eridani 16 16 in time, andis 49 more north than that ftar. Feb. 7, 1785. A beautiful, very brilliant globe of light; a little hazy on theedges, but the hazinefs goes ofi very fuddenly, fo as not to exceed the 20th partof the diameter, which I fuppofe to be from 30 to 40. It is round, or perhapsa very little elliptical, and all over of an imiform brightnefs : I fuppofe the intenfityof its light to be equal to that of a flar of the ninth magnitude. It precedes thethird b (Fjl. 6.) Crateris 28 36 in time, and is 1° 25more north than that flar. /■h/.,M,>^ n//..v-Yr [ ^67 ] XIII. Remarks on fpecijic Cravitws taken at different Degrees ofHeat, and an eajy Method of reducing them to a common Stan-dard. By Richard Kirwan, Efq. F. R. S\ Read February 17, 1785. THAT a comparative view of the weiohts of equal vohimesof water and ail other fubftanccs is highly ufefnl 011many occations, Is too well known to require any proof; butthat a principal ufe refulting from this comparifon, when pro-perly made, is unattainable by a perufalof the common tables*I fliall here endeavour to (hew, and at the fame time pointout a remedy for this defe(5l. One capital advantage derivable from a table of fpecific gra-vities, is the knowledge of the abfolute weight of any fohdmeafure of the fubftances therein contained, or that of the folidmeafure of a given weight of thofe fubftances, a cubic foot ofwater being fuppofed to weigh 1000 ounces avoirdupois, andconfequently a cubic inch of water weighing 253,182 the authors who havedifcov
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