I 



I 



JV* J, Taylor on Rock Guaiio. 179 



(II.) 



3'9922 grammes 0'3836 grams. BaO, SO3 gare sulphuric acid 3*30 



« 0-1761 ** CaO, COa « lime 2*48 



" " 0-0099 « Ag « chlorine 0-08 

 " « 0*0531 " 2MgO, P0& " phosphoric acid 85 



"■ 0'0089 " NaCl « soda 0-88 



it 



« 





Per-centage sulphuric acid, 3*30 Oxygen ratio, 1"97 



phosphoric acid, 0'85 " " 0-54: 



lime, 2-48 « " O'TO 



soda, 0-88 « " 0*22 



« « chlorine, 0-08 « " 



There was in this analysis a loss of lime or magnesia, and alsa 

 of the insoluble residue. 



A selection was made from other specimens which resembled 

 very nearly that above described ; it was treated in the same 

 manner as (II), but the results show a marked difference, there 

 being a smaller per-centage of phosphate of lime dissolved from 

 (11) than from (III), and a proportional amount of clilorid of so- 

 dium. To this fact I shall again refer. 



The following is the result of the analysis : 



(III.) 



Tlie residue before Tveighing was carefully dried at 100° C. 



2-'?271 grammes M, residue of 2'31'77 gram. 84-98 



** " 0-0095 grams. Ag gave chlorine, 0-11 



" " 0-3603 " BaO, SOa " sulphuric acid, 4-91 



0-2536 " CaO, SOa « lime, 3-84 



" " 0-0083 " 2MgO, P05 « magnesia, 0-11 



" " 0-0600 " 2MgO, POs " phosphoric acid, 1-58 



« " 00201 " NaCl « soda, 0-40 



<( u 



Chlorine, O'll per cent. Oxygen ratio, 



Sulphuric acid, 4-91 " " « " 2-94 



Phosphoric acid, 1-58 « " « « o-88 



Lime, 3-84 « " " " 1-09 



Magnesia, 0-11 « « « « 0-04 



Soda, 0-40 « « « « 0-10 



From another portion of the rock the black portions were 

 selected for analysis ; the quantity of sulphate of lime is verj 

 inconstant. The results of the analysis were as follows : 



(TV.) 



0-91 70 grams. -0536 gram. BaO, SOa gave sulphuric acid, 2-01 p. c. 



" « 0-0510 *» CaO,C02 " lime, 3-13 " 



" ** 0-1532 «* FeaOs ," sesquioxydof iron, 16-71 •* 

 " « 0-1123 « AI2O3 " alumina, 12-25 " 



2-0741 « lost by heating, 0-3254 35-69 « 



" « insoluble residue, 0-1314 6-13 « 



Owing to an accident to the platinum crucible just before 

 weighing, the phosphoric acid was not determined. 



