568 



CATALOGUE. — PRACTICAL ASTRONOMY, TIDES. 



The pagoJ» in K.cw gardens, from the ground 118J 



The west end of the Tarpeian rock - 151 



The Palatine hill - - lOa 



The Claudian aqueduct, bottom of the canal 208 



The Janiculum - - 293 



The cross at St. Paul's, from the ground 340 



St. Peter's, summit of the cross - 53* 



From the ground 471 



Arthur's scat, from Leith pier head, 80S 



Lake of Geneva - - - 1 230 



Its greatest depth S93 



Mount Vesuvius, base of the cone - 2021 



Saddleback . - - ' 3048 



Ben Lomond - - - 3180 



Skiddaw - - - 3-270 



Malvellyn ... 3324 



Chamouny, ground floor of the inn - 33^7 



Cross fell - - - 3390 



Pendle - - - 341 1 



Table Mount, Cape - - 3454 



Schehallion - - - 3481 



BenGloe - - 3472 



Snowdon - - 3555 



BenMuir - - 3723 



Ben Lawers - - 3858 



Pennygant - - 3930 



Mount Vesuvius, mouth of the crater - 3938 



Ingleborough ... 3937 



Whernside - - 4050 



Ben Nevis - - 4350 



Hecla - - 4S87 



Pic Ruivo, Madeira - - 5141 



Summit of Mount Jura - 5523 



Summit of the Mole - - 6113 



Mont Cents, k la poste - - 6261 



Pic de los Reyes, Pyrenees - 7620 



Monte Velino, Apennines - - 8307 



City of Gondar, Abyssinia - 8440 



Canigou, Pyrenees - - 8544 



Summit of Mount Cenis - 0212 



Pic du Midi, Pyrenees - - 9300 



Quito - - . 9377 



Monte Viso - - 9997. 



Glaciere de Buet - - 10124 



Etna - . - - 10954 



Pike of Teneriffe, Borda - - 11022 



Pike of TeneriflFe, old estimate - 15084 



Pic d'Ossano, Pyrenees - - 11 700 



Aiguille d'Argentiere - 13402 



Ophir in Sumatra, Marsden - - 13842 



Monte llosa, Alps - 15084 



Summit of Mont Blanc - 1566» 



Pichincha - - 15570 



Antisana - - 19290 



Chimbora9ao - - 19595 



It may be observed with respect to General Roy's calcu- 

 lation of the mean height of the sea, that it does not appear 

 that in rivers, or even in narrow seas, we ought to add one 

 third of the height of the tides only to that of low water, 

 in order to find the level ; for it is probable that even the 

 original tides may often resemble those of lakes, where, for 

 want of breadths, the effects of a spheroidical tide cannot take 

 place, and the elevation and depression are very nearly 

 equal. 



Observations of the Tides. 



The tides are mentioned by I lomer, Aristotle, Herodotus, 

 Diodorus Siculus, Plutarch, and other ancient authors. 



Hydrology. Ph. tr. abr. II. ii. 257. IV. pt. 2. ii. 



183. VI.pt. ii. 163. VIII. pt. 2. ii. 641. 



X. pt. 2.ii. 567. 

 Moray on the tides in the Hebrides. Ph. tr. 



1665-6. I. 53. 

 *Moray on observing the tides. Ph. tr. 1665-6. 



I. 298. 



Pioposes a pump barrel with a small hole in it, and a 

 float, for measuring the height independently of the waves. 

 Specimens of tide tables. 



Moray on the tides about the Orcades. Ph. 



tr. 1673. vni. 6139. 



fWalhs on the tides. Ph. tr. 1665-6. 1. 0,63, 



297. 

 Deducing the tides from the earth's centrifugal force in 



revolving round the common centre of gravity of the earth 



and moon. 



Wallis on the tides. 1668. HI. 652. Answer 

 to Childrey. 1670. v. 2063. 



Wallis on the junction of tides in the chan- 

 nel. Ph.tr. 1701. XXnr. 1022. 



The southern tide extends as far as the Dogger Bant. 



Norwood's account of the tides at Bermu- 

 das. Ph. tr. 1667. H. 565. 



Colepresse's observations at Plymouth, Ph. 

 tr. 1668. ni. 632. 



Philips on the tides. Ph. tr. 1668. HI. 656. 



