APPENDIX. 285 



In 30° S. at Coquimbo, it is high water at '2h. and at Norfolk 

 Island it is high at about 9h. 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 Sh. lom. The 

 space between is about eight hours wide : the least diiference 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 across half tlie 

 Pacific, no comparison of times can be trusted. 



On the equator — at the Galapagos Islands — it is high 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 ^\^[de ; 

 but at New Ireland there is only- one tide m tM'ent}'-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 aljout 81i. ; and at the Philippine 

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

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

 Phihppines also feel the effects of catises 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 know^l point of comparison at the other sic? 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 Cahfornia, 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. 



Havmg 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 I2h, for the 



* A derivative tide (p. 28'J) may act here. 



