552 PHILOSOPHICAL TRANSACTIONS. [aNNO 1748. 



Ol. nucis moschatse Muschenbroek .. 0.948 Ol. raparam. Fahrenheit O.913 



01. tanaceti. Muschenbroek 0.9*6 Id. it. tinct. chalyb. m) nsicht. It. tinct. 



01. origani. Item carvi. Muschenbroek 0.94O sulphur cum sp. terebinth. Freind. 



Elixir propr. cum sale volat Item infusio It. huile de semences de navets. Mus. 0.853 



these. Freind 0.940 Sp. mellis. Muschenbroek 0.895 



01. spicae. Muschenbroek 0.93() Sp. salis ammoniaci euro cake viva O.89O 



01. rorismarini. Muschenbroek 934 Oleum aurantiorum. Muschenbroek.. 888 



Linseed oil. Newton. C 0.932 Spirit of turpentine. Newton. C. . . . 0.874 



D° Ward 0.931 Tinct. castorei. Item sp. vini camphorat 



Spirits of wine, proof, or brandy. Ward 0.927 Freind 0.870 



Sp. of wine well rectified. Newton. C. 0.86'6 Oil of turpentine. Boyle V. 22, a 0.864 



Alcohol vini. Fahrenheit 0.826 Ol. terebinth. Freind 0.79,3 



Id. magis dephlegmatum. Fahrenheit 0.825 Ol. cerae. Muschenbroek 0,831 



Sp. vini. Freind 0.818 I'inctura corallii. Freind 0.828 



Id. rectific. Freind 0.78 1 Aqua cocta. Freind 0.750 



Esprit de vin etherS. Muschenbroek.. 0.732 Air. Newton. C 00125 



Spiritus croci. Freind 0.925 AerPrincip. edit. 3. p. 5 1 2. Aer juxta 



Lamp oil. Reynolds 0.924 superficiem terrae occupat quasi spa- 

 Oleum. Ghetaldus O.916 tium 850 partibus majus quam aqua 



Oil olive. Newton. C O913 ejusdera ponderis 0.00125 



D°. Ward 0,912 The same, by an experiment made by the 



Sallad oil. Reynolds O.904 late Mr. Fr. Hauksbee, f.r.s. when 



Oleum. Villalpandus O.9OO the barometer stood at 29-7 inches. 



Id. Petit.... 0.891 See Physico Mathem. Exp. p. 74. . 0.00113 



As to the absolute weight of water, with which all the other bodies are com- 

 pared in these tables, Mr. Boyle tells us, in his Medicina Hydrostatica, that he 

 had found by his own experiments, that a cubic inch of clear water weighed 256 

 Troy grains. And Mr. Ward of Chester, who afterwards pursued this affair 

 with great accuracy, determined that a cubic inch of common clear water weighed 

 by his trials 253.18 like Troy grains, or 0.527458 decimals of the Troy ounce, 

 or 0.573697 of the ounce avoirdupois, agreeable to what Mr. Reynolds had for- 

 merly delivered, who found the cubic inch of rain water to weigh by his experi- 

 ments 0.579036 decimals of the same avoirdupois ounce, differing from the other 

 only 0.000339 parts. 



The heaviest fluid we are acquainted with, next to mercury, is oil of vitriol, 

 or water impregnated with the vitriolic acid in the highest degree we can obtain 

 it, being almost double the weight of water. The next is probably the saturated 

 solution of the fixed salt of vegetables ; being a ponderous salt, and dissolving 

 freely in water. The next to this is spirit of nitre. Spirit of salt is lighter, and 

 inferior in weight to the saturated solution of salt itself. It is observable, that 

 marine or common salt, and nitre, differ little in gravity, contrary to the nature 

 of- their spirits. 



The several solutions of common salt, if accurately repeated, would show in 

 what proportion the gravities of fluids increase, on the addition of salt ; and tliat 

 sea water does not contain Vt part of salt. 



Since the density of the air is as the force by which it is compressed, it follows 

 that the weight of any portion of air must vary in the same proportion with the 



