1466 



CRUSTACEA. 



south, 136° 51' west. These observations give a wide sweep to the 

 cold waters of the colder seasons, and throw the isocrymes of 74° and 

 68° F. ? far west of the Gallapagos. Captain Wilkes, in passing directly 

 west from Callao, found a temperature of 68° ¥., in longitude 85° 

 west; 70° F., in 95° west; and 74° F., in 102° to 108° west. These 

 and other observations lead to the positions of the isocrymes of 74° 

 68°, and 62°, given on the Chart. The line of 74° passes close by 

 Tahiti and Tongatabu, and crossing New Caledonia, reaches Australia 

 in latitude 25° S. 



In mid-ocean there is a bend in all the southern isocrymes.* 



* The following observations by Mr. W. C. Cunningham (in connexion with those of 

 other navigators), establish the fact of this flexure; they were sent by him to the 

 author, in a letter, dated Talcahuano, Chili. 



1. FROM THE HARBOUR OF APIA, ISLAND OF UPOLU, TO TAHITI. 



DATE. 



LATITUDE. 



LONGITUDE. 



WIWDS. 



BEA.f 



AIR.f 



■WEATHER. 



May 11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 

 27 

 28 

 29 

 30 

 31 



June 1 

 2 

 3 



15°02' S. 



15 02 



16 04 



17 27 



17 58 



18 50 



19 47 

 19 37 



19 57 



20 21 

 20 16 



20 18 



21 09 

 20 46 

 26 30 

 19 52 



19 23 



20 07 



21 04 



21 16 

 23 00 



22 06 

 22 46 

 21 00 



172° W. 



172 37' 

 u 



174 43 

 174 16 



173 41 

 173 28 

 172 41 

 170 47 

 169 11 

 167 21 

 167 03 

 166 37 

 164 29 

 163 33 

 163 01 



161 53 



162 22 

 162 54 

 162 46 

 162 45 



160 48 



161 19 

 160 00 



N.E. 



S.S.E. 



E. by S. 



S.E. 



E. 



S.E. 



S.E. 



S. 



S. 



S. by E. 



S. by E. 



Var. 



S. 



s. 

 s. 

 s. 



S.E. 



S.E. 

 S.S.E. 

 E.S.E. 

 N.N.E. 



Var. 

 S.S.W. 



E. 



78-3° 



78* 



78-1 



78 



78 



78 



78 



77} 



76 



76i 



76* 



76 



74$ 



75 



76 



77 



73 



73 



72 



71 



72 



74 



74 



74 



77° 



78 



78 



78 



77 



76 



76 



71 



75 



74 



72 



74 



76 



75 



74i 



75 



75 



76 



76 



76 



76 



76 



74 



75 



Fine. 

 Showery. 



" heavy rains. 

 Dark. 

 Fine, but cloudy. 



Clear. 



Clear and fine. 



Cloudy. 



Clear. 



Dark. 



Cloudy. 



Fine. 



Dark. 



Fine. 

 Cloudy. 



Clear. 

 Fine. 

 Clear. 

 Fine; at Raratonga. 



11 

 12 

 13 

 14 

 15 

 16 



22 21 

 22 24 

 22 49 

 22 29 

 22 25 

 22 37 



160 20 

 160 25 

 159 33 



158 54 



159 37 

 159 05 



E. 

 E. 



Var. 

 E. by S. 



N.N.E. 

 Var. 



73 

 73 

 73 

 72 

 71 

 71 



72 

 72 

 72 

 72 



n* 



71 



Fine. 



u 

 At Mangaia. 



17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 



21 39 

 21 06 

 20 53 

 20 36 

 20 21 

 19 10 



156 42 

 155 47 

 154 20 

 152 34 

 151 18 

 151 11 



Var. 



S.S.E. 



S.E. 

 S.S.E. 

 S.S.E. 

 S.S.E. 



S.E. 



S.E. 



E. | 



70 

 68 

 68 

 68 

 68 

 68 

 70 

 71 



71 

 72 

 72 

 73 

 74 

 76 

 76 

 76 



Fine. 



Dark. 



Fine. 



u 



H 



At Tahiti. 



f Mean temperature. 



