* I 



^ 



^ 



CROSS THE SOUTH ATLANTIC. 25 



broug-ht up the rare Terebratula rosea , and a small 

 ^' shell of a new genus^ allied to Rissoa. The re- 

 niamder of the day and part of the succeeding* one 

 were spent in a fruitless search for a shoal said to 

 exist in the neig-libourhood^ to which Capt. Stanley's 

 attention had been drawn by Capt. Broug'hton^ of 

 ^^ H.M.S. Curacoa. 



At one P.M. of each day^ when the weather was 

 favourable^ the ship was hoA e-to for the purpose of 

 obtaining' observations on the temperature of the 

 water at considerable depths^ under the superinten- 

 dence of Lieut. Dayman. As these were continued 

 durino- our outward voyao'e as far as Van Diemen's 

 Land^ and the number of observations amounted to 

 69^ the results will more clearly be understood if 

 exhibited in a tabular form^ for which the reader is 

 referred to the Appendix. '^ Two of Sixe's thermo- 

 meters were attached^ one at the bottom of the line 

 of 870 fathoms^ the other 150 fathoms higher up. 

 The depth recorded is that given by Massey's patent 

 sounding- machine. As the same quantity of line 

 was always used^the difference of depth of each day 

 should be trifling-^ varjdng- only in proportion to the 

 ship's drift ; yet on several occasions the depth re- 

 corded by the machine gives as much as 100 fathoms 

 short of the quantity of line let out."'* 



While eng-ag*ed in sounding*^ a process which 

 usually occupied three-quarters of an hour^ a boat 

 was ahva\'S at my service when birds were about the 



* Lieut. Dayman, R.N. 



