00 CALIFORNIA ACADEMY OF SCIENCES. 



change of season takes place. A. specific case of this 

 principle is discussed and well illustrated in the last Bul- 

 letin of this Academy, by Prof. Davidson, in his paper on 

 the air and water temperature at the Golden Gate. 



Note — The plates show in figures for each station: 1st, temperature; 2cl, 

 barometer; 3d, wind velocity and, when reported, the minimum velocity 

 since the last report, in brackets; 4th, the amount of rainfall. The wind 

 direction is shown by an arrow flying with the wind. The state of the 

 weather at the time of the report is shown thus: cloudy or fine day, circles 

 fully or one-half shaded; rain by L. K. or H. R., as it is heavy or light; S 

 for snow. 



