72 PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 
turesque Cruach Ardran, as far south at least as the slopes of Ben Ima; and 
to be chloritic from Ben Derag of Glen Lyon, probably nearly to Macrahanish 
Bay in Kantyre. 
From this stretch I obtained specimens fitted for analysis and also for 
forming cabinet specimens from the following places :—The west slopes of Ben 
Derag ; Craig-an-Lochan ; south-west of Meall Ptarmichan; Cruach Ardran ; 
and Ben Laoigh. 
I do not, however, know of rich specimens beyond the south-eastern slopes 
of the Ben Laoigh.* 
Of specimens from the above localities I analysed the following :— 
2. From the west slopes of Ben Derag of Glen Lyon.—Associated with 
quartz: colour, grass-green; structure, matted fine crystals, very dense. 
Specific gravity, 3° 002. 
On 1° 491 grammes— 
Silica, : ; - 3645 
From Alumina, . * 004 
3685 = 24°'715 
Alumina, L i : 21° 566 21° 657 
Ferric Oxide, . y ‘ aon Bs) 
Ferrous Oxide, , A 26 - 164 27025 
Manganous Oxide, . ; ‘47 
Lime, . : ; ; *45 
Magnesia, ‘ : ‘ 12 - 86 12°8 
Potash, . : ; ; 1°726 
Soda, : : F 3 * 054 
Water, . ; ; : 10° 886 
This is an aphrosiderite. 
3. From beneath the cliffs of Craig-an-Lochan, Perthshire—Occurs in quartz 
of a brown colour, as a confused mass of brilliant dark green minute crystals, 
rarely slightly brown from weathering ; associated very rarely with ilmenite and 
large flat transparent folic of chlorite (?) of a lighter green, which are imbedded 
in quartz in single plates. Specific gravity 2 °697. 
* The Old Red Conglomerate at Callendar contains rarely quartz nodules, with chlorite, very 
similar in appearance to that of Cruach Ardran, 
