[31]. I took the temperature at monthly intervals between October, 1896, and September, 1897. The mean annual temperature of the air in the shade would be about 64° at an elevation of between 3,000 and 4,000 feet.
[32]. At Ewa there are pumping plants capable of supplying 75 million gallons a day, the water being drawn entirely from artesian wells. (Report on Hawaii, by Dr. Stubbs, bulletin 95, 1901; U.S. Department of Agriculture.)
[33]. This hill is figured in Wilkes’ narrative under the name of Dillon’s Rock (vol. 3, p. 235). This, however, is not the Dillon’s Rock of his chart, where the name is given to a rock on the west side of the entrance to Wailea Bay.
[34]. See remarks on “crush-tuffs” on p. [334].
[35]. Species not identified.
[36]. In one of my traverses I crossed a level district extending a mile N.E. of Ndriti without changing my elevation.
[37]. At Delanasau, on the north or dry coast of the island, the average rainfall, according to many years’ observations by Mr. Holmes, is about 115 inches. At Wainunu, near the wet or south coast, the observations of Mr. Barratt and others extending over 16 years give an average of 160 inches. In the mountains this would be nearly doubled.
[38]. This question, which has so often been raised with respect to the propylites, will probably receive a different answer from different localities. The matter is further discussed on later pages.
[39]. The dyke-rock has a specific gravity of 2·7; but is slightly vesicular. It shows a few small plagioclase phenocrysts in a groundmass of felspar-lathes, augite grains and prisms, magnetite, and a little brown interstitial glass. The felspar-lathes average ·14 mm. in length and are for the most part not parallel. Secondary calcite occurs in the groundmass, and the powdered rock effervesces a little in an acid.
The rock forming the offshoot of the dyke differs only from the parent rock in its more vitreous character. Although the felspars and augites of the groundmass are fairly developed, the residual glass is much more copious, and in places where it has segregated, forming “lakelets,” it has been subjected to an alteration often observed in palagonite when there are concentric alternating zones of a tan-coloured fairly refractive material and calcite.