Manchester Memoirs, Vol. lix. (191 5), No. VZ. 63 



Sheets 38 and 39 are very early ; the spellings " hidro- 

 genous " and " hidrogen " and " gasses " were discarded by 

 Dal ton before 1803. 



Fourteen Diagrams representing the A rrangements of A toms y 

 in some cases with Atmospheres of Heat surrounding 

 them. 



Sheet 40. 



Four atoms with their atmospheres of heat in contact. 

 Each atom with its atmosphere occupies a square. 



Sheet 41. 

 Plate VIII. 

 Four atoms with their atmospheres of heat. 



Sheet 42. 



Atmosphere of heat around two sets of four atoms. 



Sheet 43. 



Plate VIII. 



The mutual repulsion of the atmospheres of heat 

 round two atoms, represented to show a diminishing 

 repulsion with increasing distance. This diagram may 

 be the one referred to by Dalton in the note-book of the 

 Birmingham lectures of 18 17, as follows : — 



11 Repulsion of atoms inversely as the Distance. 

 Fact that condensation is as pressure — 1. Tube expt. 



* * 

 2. Diagram J 



* # 



Sheet 44. 



Inscribed "Fluids"— (*) "elastic," (/;) "inelastic." 

 (a) Represents gaseous atoms with their atmospheres 



of heat. 



