Note 370 — Chapter XLV · THE ACID ROCKS
Reading edition
Fragments of acid rock were detected by Prof. Cole in the gravel among the Ardtun basalt of Mull, as already noticed on p. 212.
[371] Tschermak's Min. und Pet. Mittheil. 1878, p. 412.
[372] Scientif. Trans. Roy. Dublin Soc. vol. vi. (ser. ii.) 1896, p. 77. This paper gives an excellent account of the microscopical character and mineralogical and chemical compositions of these rocks.