^{page 206 note 4} The above depths are taken from the Admiralty Chart.

^{page 207 note 1} At one spot, in the north of the Red Sea, a recent accumulation of oolitic grains was described by Walther, J., “Die Korallenriffe der Sinaihalbinsel,” 1888.Google Scholar

^{page 207 note 2} Marked on the Admiralty Chart.

^{page 209 note 1} I have found in other basalts or basic andesites (as in one from Auvergne) this appearance of incipient spherulites, which are not distinguishable on microscopic examination.

^{page 209 note 2} Two slices lent me by MrSwamy, Coomara, taken from blocks near here, are from very similar rock, but with the glassy base better defined and without the brown pyroxene.Google Scholar

^{page 209 note 3} The disintegration of the rocks may have been helped by a rainfall greater in its amount in past times; and Mr. Jones remarks on the tanks built to hold water, now standing empty.

^{page 210 note 1} One example is described where the boulders appear as if piled by the sea, forming a kind of island in the middle of the Birkhud Raised Beach to the north of Perim.