84 PROFESSOR HEDDLE ON THE MINERALOGY OF SCOTLAND. 
their first exposure. The water which is given out when heated to 212° is 
recovered upon mere exposure to an atmosphere in a normal condition as 
regards its dampness. 
There is so much of this mineral exposed upon the surface of the rock about 
Dumbuck that it cannot, in virtue of the manner in which it functions as regards 
the nature of the grasp with which it: holds part of its water, but affect to a 
certain extent the state of the atmosphere in the neighbourhood,—moistening it 
while the sun heats up the rock, and dessicating it in cold weather. 
6. There is an alkali-charged variety of this mineral which is found filling small 
nests in this tufa of Elie Ness near the old Summer-House. This is similar in 
all external characters to the others, but contains— 
Silica, ss : : HL OD. CoS 
Alumina, : : F 6° 589 
Ferric Oxide, . : ; 1° 232 
Ferrous Oxide, ; . 14:84 
Manganous Oxide, . : 246 
Lime, 4 ‘ . : S380 
Magnesia, : 5 . 8983 
Potash, ; ‘ 3° 048 
Soda, ; ] ' ; 5° 274 
Water, . : ‘ ee hays ire 
100° 535 
Loses 5 * 556 of water at 212°. 
Substances similar in general appearance to Delessite occur in thin veins in 
granitiform-diorite in a quarry west of New Leslie, in Aberdeenshire, and at 
the Mull of Oe in Isla. 
CHLOROPHALITE. 
1. This species, established by Dr Maccu.LocH on specimens obtained by 
him from beneath the Scuir More ridge of the hill of Creag-na-Stiarnin in 
Rum, has never been analysed. 
From a general similitude in appearance, Maccutiocu himself supposed that © 
the saponite from Fife (? Elie) was the same, and he states that a specimen 
brought from Iceland by Major Peterson was “similar in all characters.” 
Others have conjectured that certain substances more or less similar and 
similarly circumstanced were the same; but that all these conjectures were 
likely to prove correct was more than doubtful, seeing that they were based 
upon the substances having been said to be “ chlorite-like minerals,” while the 
