226 



Dried at 212". 



Carbon . . 26.58 

 Hydrogen . 2.86 



Oxygen . . 25.97 



Oxide of lead 45.36 44.59 





100.00 





The tribasic salt gives 



Dried at 212°. 





Carbon . 



21.89 



22.07 



Hydrogen . 



3.06 



2.82 



Oxygen 



23.75 



23.73 



Oxide of lead 52.30 



51.38 





100.00 100.00 



Formula deduced. 



C.23 = 138.0 26.93 



H,5 = 15.0 2.93 



On = 136.0 26.54 



2.PbO = 223.4 43.60 



512.4 100.00 



Formula deduced. 



C.23 = 138.0 21.20 



H, = 18.0 2.76 



O20 = 160.0 24.57 



3.PbO= 335.1 51.47 



651.1 100.00 



If we consider the xanthorhamnine, as dried in the oil- 

 bath, to be then anhydrous, the bodies analyzed become 



Xanthorhamnine, dry = C23 H12 Oi4. 



do. dried at 212°. = C23 H12 O^ + Aq. 



do. dried in vacuo = C23 H12 014 + 15 Aq. 



1st lead salt, C23 H12 On + 2. PbO + 3 Aq. 

 2nd lead salt, C23 Hi2 O^ + 3 PbO + 6 Aq. 



The xanthorhamnine is thus formed by the addition of 

 one equivalent of water and two of oxygen to the chry- 

 sorhamnine, as C23 Hu On + HO + 02 = C23 H,2 O14. And 

 if we were to consider the substance dried in the oil-bath at 

 320° still to retain an atom of water, it should be simply 

 oxidated chrysorhamnine, being, when dry, 



C23H„Ou + 20. 



The Rev. H. Lloyd, V. P., read a supplement to a former 

 communication " on a New Magnetical Instrument, for the 

 measurement of the Inclination and its Changes." 



