JANEIKO TO THE COAST OF PErai. IQl 
At IS, Lat. by observation 22° 54' S. Temperature of the 
sea 68°.5. At 4 o''clock r. m., being about 12 miles to the 
N W., the colour of the sea had changed from a dark-blue 
to a bottle-green. Temperature 65*^, a difference of S°.5^ 
distance from the coast about 20 miles. At 4, altered our 
course to NE., with the intention of entering the port of 
Cobijo. At 8 p. M. hove to about three leagues distance 
from the coast. Evening clear. Temperature of the air at 
10 p. M. 660.5, hygrometer 21°.'' 
We should remark, in addition to this outline, that Mr 
Jameson has added two tables at the end of his journal: 
one of these, we have already said, is meteorological, con- 
taining the state of the thermometer in the air at 10 morn- 
ing and evening, and the temperature of the sea. This 
last, he observes in an accompanying letter to Professor 
Jameson, was daily ascertained at 12 o'clock, in the usual 
way, by immersing a thermometer in a bucket of water 
fresh-drawn. In this table the humidity of the atmosphere 
is also noted, as observed at 10 morning and evening ; 
" this was determined by two delicate centigrade thermo- 
meters, each degree of which is divided decimally ; and the 
differences betwixt the dry and humid bulb exposed freely 
to the air, were daily registered." The state of the weather 
and the wind, as well as the latitudes and longitudes, are 
also inserted in this first table. 
The second shews the daily differences and rates of three 
chronometers kept by Mr Jameson himself on board the 
packet. In one column are the differences between Brown's 
and Barraud's chronometers, in another between Brown's 
and Grant's, and in another between Barraud's and 
Grant's : thus the relative rates of each could be ascer- 
tained without great difficulty. Mr Jameson also gives 
here the mean temperature of each day, in case that should 
affect the instruments. 
These tables we here insert, 
