346 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



The following table and diagram of observations upon the temper- 

 atures of water and air in the Golden Gate, at 7 a. m., for ten years, 

 1874 to 1883, are taken from Davidson's "racilic Coast Pilot.'' 



TahU' showiuq the tonperntiirc of the iratcr itinl air hi ihv (lohlen date for lii ycai's, from 



.1S74 io 1SS3, inclusirc. 



[Obsorviition.s tukcu daily at 7 a. m., and rodurod to inoiillily inoans.] 



The data contained in the above table are reruesented graphically 

 in the following diagram : 



Prof. Davidson says: ''The lowest temperature of the water is for 

 the month of Januarj'^, 50.49° j and the highest for the month of Sep- 

 tember, .50.08° F.," and he adds that "the tempeiature of the air follows 

 very closely that of the water.'' 



Hourly water temperatures taken by the Albatross at the foot of Mar- 

 ket street and at the Union Iron Works, San Francisco, for limited 

 l)eriods, indicate a slightly higher tempeiature than in the (iojdeu 

 Gate, as may be seen from a study of the accompanying table. Tem- 

 peratures taken by the saihe vessel at Mare Island, where the water is 

 more subject to the inllnence of the Sacramento Kiver, show a much 

 lower temperature. 



