141 
GLENMALUR. 
Per Cent. Atomic Quotients. Proportionals. 
Sens rat ST HOA AB Ss PORAB SU”. het ato B84 
Ainmimaes: . . 2 19:04 6. 2 O:370).96 .e 1:00 
Meemesia,at 0!) S102) ~ 2. 0051 
Hamers wht els. v4 Drace,. ») .. :0:000 
Fe i be 1MOCTA,. «:..< k MIBI dene 
Soda, Pr ies el OA 3 ee O8S 
Loss by ignition, 0°78 
98°70 ; 
Sp. gr. = 2:560. 
‘¢On examining these analyses, it will be found that not 
even in a single instance do they deviate from the well-known 
composition of orthose or potash felspar. The average ratio 
of potash to soda from these analyses is 9:2; the greatest 
amount of soda present being 34 per cent., which is found in 
the specimen taken from the Three Rock Mountain, which 
quantity, although relatively great, is less than one-third of 
the potash in the same specimen. 
‘We find, from the extract which I have read, that Sir 
Robert Kane was unwilling to found a statement as to the 
nature of our granites so important as this on an inference 
drawn from the analysis of a water taken from the locality ; 
for he affirms that his conclusion is verified by a number of 
analyses of granite specimens taken from various parts of the 
range, and that in all these specimens so great was the excess 
of the soda over the potash, that he felt himself warranted in 
drawing the conclusion that the potash should, in most cases, 
be considered as belonging to the mica, and that the felspar 
was almost exclusively an albitic or soda felspar, containing 
only in some cases a small quantity of replacing potash. 
‘On referring to the analyses which I now lay before you, 
I think I am warranted in the statement, that the felspars of 
this district are orthose or potash felspar, containing only 
small quantities of replacing soda. . 
VOL. VI. ) 
