PACIFIC AND BEERING'S STRAIT. 11 



Our first measurement was with barometers, which, calculated CHAP, 

 by Mr. Daniel's new formula, gave the base of the flag-staff 7* 



on the Peak, above half-tide . ■ . 2308 feet. j u j y 



The next, by trigonometrical measurement, gave 2306 1825. 



On my return to the same place three years after- 

 wards, I repeated the observations, which gave the 

 height as follows : — 



By barometrical measurement . . . 2291 \* feet. 



By trigonometrical measurement . . • 2305^t 



The Sugar Loaf by the first base in 1825 was 1286 



by the second base in 1828 was 1299J 



The astronomical observations were made at an 

 observatory erected in Mr. May's garden at Gloria, 

 an indulgence for which I feel particularly indebted 

 to that gentleman, as well as for other civilities which 

 I received from him during my stay at the place. 



On the 13th of August we sailed from Rio Ja- August. 

 neiro for the Pacific: a passage interesting from the 

 difficulties which sometimes attend it, and from its 

 possessing the peculiarity of producing the greatest 

 change of climate in the shortest space of time. 

 The day after we left the port, we encountered a 



* This differs sixteen feet from the first result, which may partly 

 be owing to the barometers, on this occasion, not being in such 

 good order as at first : the amount, however, is so small as almost 

 to need no apology, particularly as the observations were made on 

 days as opposite as possible to each other — the first in drizzling 

 rain, the last on a clear sunshining day — whereby the formula was 

 put to the severest trial. 



t In this operation I was assisted by the late Captain Henry Fors- 

 ter, R.N. an officer well known to the scientific world, with whom 

 I had the pleasure to become acquainted at this place. 



| The difference in these measurements is, no doubt, owing to 

 there being no object on the summit of the hill sufficiently defined 

 for the purpose of observation, and it is almost impossible to 

 ascend it. 



