135 



The mean of the highest temperature of water which is between 

 six hundred to eight hundred miles west from San Francisco for the 

 year is sixty degrees and thirty-three one-hundredths. 



The mean of the lowest which is within one hundred miles west 

 of San Francisco for the year, is fifty-five degrees and fifty one-hun- 

 dredths. The warmest water on any day was May third, eighteen 

 hundred and seventy-six, eight hundred miles west of San Francisco, 

 when it was sixty-nine degrees. The coldest was April twenty-fourth, 

 eighteen hundred and seventy-six, in the same vicinity, when it was 

 forty-seven degrees. 



The mean temperature of the water in midocean for each month, 

 excepting July, when the steamers followed the northern route, was 

 as follows: 



The coldest water in midsummer, in latitude forty-two degrees, was 

 found March seventeenth and eighteenth, eighteen hundred and 

 seventy-six, when it was forty-two degrees. The warmest was July 

 twenty-first and twenty-second, eighteen hundred and seventy-six, 

 when it was sixty degrees. 



The coldest at latitude thirty-two degrees was January twenty- 

 ninth, eighteen hundred and seventy-six, when it was fifty-two 

 degrees ; and the warmest, August sixteenth and seventeenth, eighteen 

 hundred and seventy-six, when it was seventy degrees. 



From these figures we find that this gulf stream, from the time it 

 leaves the equatorial regions until it reaches east of Yokohama, has 

 parted with its heat until it is reduced to a mean for the year of 

 sixty-five degrees and forty one-hundredths. Traveling to the north- 

 east, crossing the Pacific, and turning south along our coast, it has 

 continued to part with more heat until, when opposite San Francisco 

 and for a distance of nine hundred miles, it is reduced to a mean for 

 the year of fifty-eight degrees and four one-hundredths, a difference 

 of seven degrees and six one-hundredths. That part of the ocean 

 from which comes our southwest winds beyond this gulf stream has 

 a mean temperature for the year of sixty degrees and fifty-two one- 

 hundredths. 



I find that the temperature of the air on this part of the Pacific 

 rarely varies more than three degrees from the temperature of the 



