62 Coward & Harden, Da/ton's Lecture Sheets. 



Apparatus for gas analysis. 

 Sheet 36. 



A Volta eudiometer with wires to form the spark gap. 

 Also, a cylinder, apparently to hold the eudiometer tube. 

 Also, a graduated tube, with the lower open end enlarged, 



for collecting and measuring gases and treating them 



with reagents. 



The Volta eudiometer is described in " New System," 

 I, i, 274. It was frequently employed by Dalton in his 

 investigations on gases. 



Three Diagrams representing Speculations on the Nature 



of Solutions of Gases in Water : 

 Sheet 37. 



"Air in Water." Two diagrams, closely represented 

 by the carefully drawn Plate 3 in Mem., 1805, 6. 



Under one diagram are the words " Oxygenous, 

 Nitrous, etc., ^- Density," and under the other " Azotic, 

 hydrogenous, etc., / T Density." 



Sheet 38. 



Two diagrams, similar to those on sheet 37. Inscribed 

 " Hidrogenous, Azotic, and Carbonic oxide Gasses " and 

 " Olefiant Gas in Water." 



Sheet 39. 



Two diagrams, similar to the above, inscribed 



" Oxigenous, Nitrous and Car- 

 buretted Hidrogen Gasses." 



[Fig.] 



"Oxigenous gas, etc., in water." 



N.B. Distance of the true at- 

 mosphere only \ of what 

 it ought to be. 



" Carbonic Acid, Sulphuretted 

 Hidrogen, and Nitrous Oxide." 



[Fig.] 



"Carbonic Acid Gas, etc., in 

 Water." 



