NO. 2 



SOLAR CHANGES — ABBOT 



entitled " Solar Radiation and Weather, or Forecasting Weather from 

 Observations of the Sun," ' in which the barometric pressure for the 

 cities of Winnipeg, Chicago, and New York, are compared, cor- 

 responding to conditions of high, medium, and low solar constant 

 values. The data from which these curves are plotted are given in 

 table 3. In plotting the figure, the dotted curves represent the march 

 of barometric pressure corresponding to high solar constant. 



0^\ ^Z J 4 fy O I Z 1 4 5 | 2 1 f f 



Fig. 9. — Barometric pressures attending and following high and low states 

 of solar radiation. 



In order to bring out what seems to me a strong case of continuity, 

 I have brought together the pairs of barometric curves corresponding 

 to the largest solar constant dififerences at the top of the figure, those 

 corresponding to the smaller intervals lower down, and the mean 

 at the bottom. It will be seen that for each of the cities the greatest 

 deviation in barometric pressure corresponds to the greatest in solar 

 constant, the next smaller to the medium in solar constant, and the 

 least to the smallest difference in solar constant. The reader will 

 perceive also that generally the full and the dotted curves run con- 

 trastingly like the right hand to the left. He will also see that the 



' Smith.'-onian Misc. Coll., Vol. 77, No. 6. 192; 



