64 Coward & Harden, Dalion's Lecture Sheets. 



(b) Represents the closely packed atoms of a liquid or 

 solid, without atmospheres of heat. 



Sheet 45. 



li Atoms" of steam repellent by virtue of their atmos- 

 pheres of heat, above the close-packed atoms of water 

 without heat. 



Sheet 46. 

 Plate VIII. 

 " Heat in an atmosphere and in a vacuum." 

 A reference to " heat in a vacuum " is found in Dalton's 

 "New System," L, i., 73 (1808): ". . . . interstitial heat 

 amongst the small globular molecules of air, . . . [which] 

 scarcely can be said to belong to them, because it is 

 equally found in a vacuum or space devoid of air, as is 

 proved by the increase of temperature upon admitting 

 air into a vacuum." 



Sheet 47. 



Six atoms, four of one size, two of another, with their 

 atmospheres of heat. These are figured similarly in 

 " New System," I., ii., Plate 7. 



Sheet 48. 



In three equal areas are disposed atoms of hydrogen, 

 nitrous oxide and carbonic acid. A similar diagram is in 

 " New System," I., ii., Plate 7, but whereas in the book 

 equal numbers of atoms of all three gases are present, in 

 the sheet the numbers are in the ratio 9:7:7. 



Sheet 49. 



Entitled " Compound Atmosphere." There is a uni- 

 form distribution of "atoms" of nitrogen, oxygen, water 



