METEOROLOGY AND ALLIED SUBJECTS. 



29" 



who also furnished most of the instructions. These observations were 

 taken every five minutes with barometer, thermometer, anemometer, 

 &c. It is demonstrated, by meaus of these observations, that the re- 

 turn current of air is comparatively thin and feeble, and also that the 

 sea wind, like the land wind, has only a feeble power. {Z. 0. G. M., XV, 

 p. 448.) 



Professor Airy has published the results of the reduction of the pho- 

 tographic records of pressure and temperature at Gl'eenwich since 1849. 

 The annual wind ''roses" for these two elements are as follows: 



The monthly means, including those of earth temperatures, are shown 

 in the following table. The air temperatures refer to the years 1849 to 

 1868, for the first part of the table; but for the sake of comparison with 

 the earth temperatures they have, in the second part of the table, been 

 recomputed for the years 1847 to 1873, and are given in degrees cent. : 



{Z. 0. G. M., Vol. XV., 1880, p. 405.) 



Professor Finger, of Vienna, has published a second memoir on the in- 

 fluence of the earth's rotation upon the winds. As several of liis funda- 

 mental assumptions differ from those introduced by Ferrel, his results 

 differ correspondingly. He concludes that the gradient in the hori- 

 zontal direction perpendicular to the respective wind direction is entirely 

 independent of the friction and other resistances to the motion of the air; 

 and, again, that the influence of the ascending vertical movement is to 

 depress the barometric pressure for south winds and raise it for north 



