$6 Coward & Harden, Dalton' s Lecture Sheets. 



of atoms of each of the elements as the modern formulae, 

 had Dalton used double atomic weights for oxygen and 

 carbon. 



Sheet 23 (reverse side). 



Plate VII. 

 The atoms C 2 H 2 ON are arranged in two different ways 

 to represent albumen and gelatine respectively, and under 

 them is written : — 



Exp*- 



Albumen. 



53 Carbone 



27 Water 



20 Ammon. 



Theory. 

 44 Carbone 

 32 Water 

 24 Ammonia 



Exp*- 



Gelatine. 



48 Carbone 



31 Water 



21 Ammon. 



ioc 100 100 



These formulae are truly isomeric. It is also interest- 

 ing to note the little respect Dalton shows for the analy- 

 tical results, since he is satisfied that there is sufficient 

 accordance between the experimental figures and the 

 calculated ones. 



The origin of these figures is found by reference to 

 the Laboratory Note-book iv, p. 59, which shows Gay 

 Lussac's analytical figures for albumen and gelatine as 

 nearly the above, viz. : — 



Albumen. 



Gay Lussac. 





Gelatine. 



Gay Lussac 



1 oxy. 7 



233 



2 39 



1 oxy. 



7 



28 1 



27*2 



3 carb. 1 6*2 



52*6 



5 2 '9 



2 carb. 



108 



43i 



47'9 



2 hyd. 2 



6-6 



7*5 



2 hyd. 



2 



8 



79 



1 azote 5 



165 



157 



100 



1 azote 



5 



20J 

 100 



17 



30-2 



100 



100 



or 1 Am. 







1 Am. 









1 Water. 







1 Wat. 







• 



3 Carbone. 





2 Carb. 









