in the French Ship Urania. 27 



greatest care at every place where they stopped, and in every si- 

 tuation throughout the voyage which would permit. The stations 

 where these experiments were made are nine in number, viz. 

 Rio Janeiro (first stay) ; the Cape of Good Hope; Port Louis, 

 in the Isle of France; the Island of Rawak; the Island Guam; 

 the Island of Mowa, in the Sandwich Isles ; Port Jackson; the 

 Falkland Islands; and at Rio Janeiro (second stay). 



2d. Each day during the voyage, two officers at least took 

 by rotation the necessary astronomical observations to ascertain 

 the situation of the vessel at sea, and, on shore, the positions of 

 the different observatories ; to regulate the chronometers, &c. 

 All these observations have been transcribed into journals de- 

 stined for that purpose. 



3d. The magnetic phaenomena were at the same time the ob- 

 ject of constant and multiplied studies, as well at sea as in all 

 the places which they touched it. They comprise observations 

 on the magnetic declination and inclination ; on the intensity 

 of both when tried by the horizontal needle, or the needle of in- 

 clination; and also on the hourly and periodical variations in 

 the declination. 



4th. Comparative observations on the temperature of the air, 

 with that of the sea at its surface, were made every two hours 

 during the whole course of the voyage. This considerable mass 

 of results may be useful to determine the isothermic lines on the 

 terrestrial globe. 



5th. More than 60 specimens of sea- water, taken in the seas 

 which they traversed, were put into as many flasks, perfectly 

 sealed up, iti order to be analysed on their return. Each flask 

 was labelled with the latitude and longitude of the spot where the 

 water was drawn. 



6th. A meteorological journal kept every hour during the 

 whole voyage, will show in methodical order all the observations 

 on the thermometer, the barometer, and the hydrometer, which 

 they made both by sea and land. They will also show the indi- 

 cations of the prevailing winds, and their degrees of force, the 

 electrical and aerial phaenomena, &c. 



7th. The barometrical variations could not be observed with 

 precision except in the places which they touched at. The re- 

 sults of them have been consigned to a particular register. 



8th. It was not possible to observe the tides and currents, ex- 

 cept at a small number of points ; but the data acquired at Rio 

 Janeiro, at the Isle of France, at Rawak, and at Guam, are not 

 without interest. 



9th. The number of charts formed during the voyage is 

 about 30. A part of them have already been completed ; but 

 the whole of the materials collected on this subject, and classed 



D 2 with 



