H. How on Gyrolite in the Bay of Fundy. 13 
Dawson’s theory of the origin of the rock from volcanic waters 
acting on the carbonate of lime; it is interesting to observe that 
Bechi found* the same mineral, with other borates, in the lagoons 
of Tuscany. ‘The hydrated conditions of both the borates found 
in the rock here and of the associated Glauber salt shows the 
action of water, but that of ordinary sea-water would not acconnt 
for the presence of boracic acid. As regards the soda, the sul- 
hate and borate of lime were probably the substances originally 
present, and chlorid of sodium in water being introduced might 
remove part of the calcium as chlorid, and furnish borate and 
sulphate of soda; it is confirmatory of this view that a small 
quantity of rock-salt in crystalline grains has lately been found 
in the Gypsum 
Art. IIl.—On (yrolite occurring with Calcite in Apophyllite in the 
Lrap of the Bay of Fundy; by Henry How, Professor of Chem- 
istry and Nat. Hist, King’s College, Windsor, Nova Scotia. 
TE Mineral Gyrolite was first described by Professor Ander- 
son of Glasgow,+ as a new species from the Isle of Skye; it is 
stated by Greg and Lettsumt to occur without doubt at two 
localities in Greenland, and, according to Heddle, at Farée. The 
only other notice of it that I am acquainted with is by L. Sx- 
mode of explaining its origin by change in apophyn es I met 
of fractured crystalline spo lite, and, ft r fet a = 
concretions of pearly lustrous pla’ 
* Dana’s Min., 4th Ed., 394, 395. 
+ Trans. Roy. Soc. Edin. and Phil. Mag., Feb., 1851. 
Manual of Muin., p. 217. : 
é First Supp. to Dana’s Min., p. 9. This Jour., May, 1855. 
