ANNOTATIONS AND ADDITIONS. 323 



railway, can alone decide the much discussed problem 

 either affirmatively or negatively. That will be done at 

 last, which should, and, had my advice been taken, woidd 

 have been done in the first instance. 



( 19 ) p. 300 " Thai which is awakened in us ly childish 

 impressions or by the circumstances of life." 



On the incitements to the study of nature, compare 

 Kosmos, Bd. ii. S. 5, (English edit. vol. ii. p. 5), 



p. 302. " Of importance for the exact determi- 

 nation of the longitude of Lima" 



At the period of my Expedition, the Longitude of Lima 

 was given in the maps published in the Deposito hidro- 

 grafico de Madrid, from the observations of Malaspina, 

 which made it 5h. 16m. 53s. from Paris. The transit of 

 Mercury over the Sun's disk on the 9th of November, 1802, 

 which I observed at Callao, the Port of Lima, (in the 

 northern Torreon del Fuerte de San Felipe) gave for Callao 

 by the mean of the contact of both limbs 5h. 18m. 16s. 5, 

 and by the exterior contact only 5h. 18m. 18s. (79 34 

 30''). This result (obtained from the Transit of Mercury) 

 is confirmed by those of Lartigue, Duperrey, and Captain 

 FitzRoy in the Expedition of the Adventure and Beagle. 

 Lartigue found Callao 5h. 17m. 58s., Duperrey 5h. 18m. 

 16s., and FitzRoy 5h. 18m. 15s. (all West of Paris). As I 

 determined the difference of longitude between Callao and 

 the Convent de San Juan de Dios at Lima by carrying 

 chronometers between them four times, the observation of 



