104 



Proceedings of the Royal Irish Academy. 



dry oxygen, and the "svater given off collected in a tube filled ■u'ith 

 calcium cMoride. The oxide was afterwards ignited to bright redness 

 in air. 



Calcium chloride tube, 

 Calc. chl. tube + water, 



grams. 

 65-3250 

 65-4680 



•1430 -OH, 



Oxide after ignition in the tube, 

 Oxide after ignition in air, 



grams. 

 •5493 

 •5293 



The results of this experiment are compared below with the theory 

 for C03O5, 4H0O. For a reason which will be seen further on, I have 

 added the theory for Co.Os, SH.O. 



Theory for ( 



:030.3, 4H2O 





FoTind. 



Error. 





grams. 





grams. 



grams. 



4H2O, . 



, -1549 





-1428 



. -^012 



C03O5, . 



, -5534 





•5493 



. --004 



C03O4, . 



. -5190 



Percentages. 



•5293 



. +-013 



C03O3, 



4H2O. 



Foimd. 



C02O3, 3H2O 



OH3, . 



21-86 



20^16 





24-54 



C03O4, . 



73-27 

 95-13 



74-68 





73-05 





94-84 



97-59 



"Winkelbleck obtained an oxide in the same way as I prepared my 

 samples, only that he boiled his with strong potash before washing it. 

 He dried his oxide over strong sulphuric acid. According to him, the 

 formula is C02O3, SH^O. His results were as follows : — 



Per Cent. 





(1) 





Per cent. 

 Theory. 



2Co, . 



. 53-83 



53-93 



53^64 



30, 



. 2r62 



21-46 



2r82 



3H.0, . 



. 24-26 



24-61 



24-54 



