14 H. How on Gyrolite in the Bay of Fundy. 
smal] quantities . luni eic., SO end. was isc eon 
How. Anderson. 
Potassa, 1°60 ewes 
esi 0-08 0-18 Calculation. 
Alumina, te 1°48 Po A —~ 
Lime, 29°95 83°24 82°26 2Ca0 = 56 
Silica, 51°90 50°70 52°18 2810; = 90°6 
Water, . 15°05 1418 15°55 SHO ==: 370 
99°85 99°78 99°99 173°6 
and a general accordance is observed sufficient to show the iden- 
tity of chemical composition in the minerals examined; the small 
quantity of potassa present in my specimen probably modified the 
blowpipe character a little as 1 found it not to exfoliate com- 
pletely, and it fused without any difficulty, and even with some 
kt emir 
Anderson that big occurs associate twit: atilbite, laumontite 
and gyrolite is very well seen on comparing the respective theo- 
retical percentages of their constituents, eh 
Si0s CaO KO HO 
rar gas == 62°10 26°00 440 ES fag variable. 
lite = 52°18 32-26 
two fragments of the gyrolite and no evidence of its existence 
obtained. 
* See Dana’s Min. I, p. 282-238, 
PS Ce iis. 
