APrENDIX. 



285 



In 30*^ S. at Coquimbo, it is high water at ^h. and at Norfolk 

 Island it is high at about 91i. The intermediate space of ocean is 

 nearly eight hours wide.* 



In 20° S., at Iquique, it is high water at Ih. 30m., and at New 

 Caledonia, in the same parallel, it is high water at 9h. 15m. The 

 space between is about eight hours wide : the least dilference 4.15. 



Near 10°, or 12°, at Callao, it is high water at about ten; but 

 as on this parallel a multitude of islands spread a^cross half the 

 Pacific, no comparison of times can be trusted. 



On the equator — at the Galapagos Islands — it is liigh water at 

 8h. 20m. ; and at New Ireland it is high water at 3h. 00m. — a dif- 

 ference of seven hours nearly. The ocean is here eight hours wide ; 

 but at New Ireland there is only one tide in twenty-four hours— an 

 anomaly to be considered presently. 



The parallel of 10° N. is similar to that of the equator — however, 

 -we may as well examine it. At the little Isle of Cocos, and at Nicoya, 

 - on the main, it is high water at about 8h. ; and at the Philippine 

 Islands, in the same latitude, at 4h. ; the difference, eight hours, is 

 not far from the meridian distance, which is about ten hours ; but the 

 Philippines also feel the effects of causes which influence the tides 

 at New Ireland, and, generally, those of the Indian Archipelago. 



In 20° N. at San Bias, it is high water at 3h ; and at Loo-choo, 

 the nearest known point of comparison at the other sid o fthe ocean, 

 at lOh. The difference, 7 hours, is about an hour less than the 

 meridian distance. In 30° N. on the Coast of California, it is high 

 water at 4h., and at Nangasaky, in Japan, in lat. 32° 44^ at 11.12. 

 The difference, 7.12, is nearly half an hour less than the meridian 

 distance. In 40° N. it is high water at about 8h. on the American 

 coast, but for the opposite shore I have no data. In 50° N. it is high 

 water on Vancouver Island at 9h., and at the south extreme of Kam- 

 schatka it is said to be high water at about 6h. ; the difference, 9 or 

 3 hours, is anomalous — made so probably by a derivative tide. 



Having examined the Pacific, let us proceed in a similar manner 

 with the Atlantic, and the Indian Ocean : — 



In 40° S. off Blanco Bay, the time of high water is 9h. ; the 

 same as at the Falklands. 



At Amsterdam Island, one authority says 6h., another 12h, for the 



* A derivative tide (p. '280) uiay act here. 



