456 PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 
reappears. among its southern slopes, curving far inland and upward among the 
hill tarns to the eastward, again to turn back with a westerly sweep as the land 
sinks into the hollow of Glen Beg. It now passes behind the hamlet of 
Balvraid, crosses the stream which waters this glen, and skirts its southern 
banks as it undulates with a westerly strike among the low heights which form 
the base of Beineghapple. The limestone thus in its escarpment pursues a 
course much resembling in outline the figure 5. ; 
Here and again augitic minerals are to be found in it, most largely under 
Ben Chourn and Beineghapple. 
At the former hill, very fine masses of milk-white malacolite, in association 
with a sprinkling of small particles of yellow serpentine, occur imbedded in the 
lime ; sahlite in radiated crystals being also rarely found. Under the slopes of 
Beineghapple, nodular masses, somewhat resembling solid amygdaloids, of 
pale-green to white radiating sahlite, abundantly occur. Possibly these may 
be the “ zoisite ” of JAMESON. ‘ 
Beneath the lime there is here found massive, cleavable, dark smaragdite- 
green augite ; while, over the lime, there lies a singular rock composed of horn- 
blende, garnet, and pyrite, forming a compound of most unusual hardness and 
toughness. 
The malacolite, the analysis of which is now given, was got from the north 
side of Ben Chourn, about half way between Totaig and Glen Elg. It occurred 
in large foliated crystals ; was semi-transparent and lustrous. 
Cleavage angles, c on m 100° 52’, to 100° 45’; ¢ on a 105° 50’; a on m 133° 
32’; specific gravity, 3° 155. 
1:71 grammes yielded— 


Silica, : ; * 874 
From Alumina, . - 008 
* 882 a ade 
Alumina, . : : : 3D 
Ferric Oxide, . F : * 328 
Lime, : ; i . 22* 007 
Magnesia, . ; : . Ho? 
Potgshy. j 5 ; “491 
Soda, P ‘ F » 4008 
Water, . d : - 47643 
99°: 755 
Insoluble silica, 10°09 per cent. ; possible impurity, lime. 
4. From the limestone of Glen Tilt. 
This limestone, probably from its proximity to an intrusive granite, has 

