TOL. XXII.] PHILOSOPHICAL TRANSACTIONS. 573 



20t-t' • It- • Heat of a bath, by which melted wax swimming on it by cooling 

 hardens and loses its transparency. 



24 . . 2 . . Heat of a bath, by which wax swimming on it is melted by grow- 

 ing hot, and kept in continual fusion without ebullition. 



28^1- • 2|. . Mean heat between that by which wax melts and water boils. 



34 . . 2-i-. . Heat by which water has a strong ebullition, and a mixture of 

 two parts of lead, three of tin, and five of bismuth, by cool- 

 ing hardens ; water begins to boil with a degree of heat of 

 33 parts, and by boiling scarcely acquires any greater degree 

 than that of 34-i-; but iron growing cold with the heat of 

 35 or 36 parts, when hot water, and 37, when cold water is 

 dropped on it, ceases to cause any ebullition. 



40-iV« • 2-I-. . Least degree of heat by which a mixture of one part of lead, 

 four parts of tin, and five parts of bismuth, by growing hot 

 is melted and kept in continual fusion. 



48 . . 3 . . Least degree of heat, by which a mixture of equal parts of tin 

 and bismuth is melted ; this mixture with the heat of 47 parts, 

 by cooling coagulates. 



57 . . 3-i-. . Degree of heat, by which a mixture of two parts of tin and one 

 part of bismuth is melted, as also a mixture of three parts of 

 tin and two of lead ; but a mixture of five parts of tin and two 

 of bismuth, with this degree of heat, by cooling hardens, and 

 in like manner a mixture of equal parts of lead and bismuth. 



68 . . 3^. . Least degree of heat, that melts a mixture of one part of bis- 

 muth and eight parts of tin; tin by itself is put into fusion 

 with the heat of 72 parts, and by cooling hardens with the 

 heat of 70 parts. 

 81 .. 3i. . Degree of heat that melts bismuth, as also a mixture of four 

 parts of lead and one part of tin ; but a mixture of five parts 

 of lead and one part of tin, when melted, and cooHng again, 

 it hardens with this heat. 

 96 . . 4 . . Least degree of heat that melts lead ; lead, by growing hot, is 

 melted with the heat of 96 or 97 parts, and cooling it 

 hardens with Q5 parts. 

 ] 14 . . 4i. . Degree of heat, by which ignited bodies in cooling quite cease 

 to shine by night, and again, by growing hot begin to shine 

 in the dark, but with a very faint light, which is scarcely per- 

 ceptible ; in such a degreeof heat there melts a mixture of equal 

 parts of tin and regulus martis, and a mixture of seven parts of 

 bismuth and four parts of the said regulus by cooling hardens. 



