MADE ON THE ATLANTIC OCEAN. 149 



America, is not so great, as at other seasons of the year; 

 and on the edge of soundings, it will mostly be found to be 

 colder than in shoaler water. On tlie other side of the At- 

 lantic, at least in St George's Channel, the reverse is the 

 case. 



Off the coast of Ireland, the thermometer is of very little 

 service in indicating soundings ; the water seldom falling 

 more than 3°, and sometimes continuing tlie same as before. 



In using the thermometer, I deem it quite unnecessary to 

 take into consideration the relative temperatures of the air 

 and water ; as the very great changes whicli frequently take 

 place in the former, from day to day, have no sensible ef- 

 fect on the latter, which only varies with the varying sea- 

 sons. 



