4o8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 70 



Plates 16-41. — The charts. The separate numbers give the anomalies of the 

 surface temperatures in tenths of a degree Centigrade. The numbers 

 in circles give the anomalies of the air temperatures in tenths of a 

 degree Centigrade. The heavy verticle numbers give positive anoma- 

 lies, the inclined weak numbers give negative anomalies. The heavy 

 rings indicate positive, the weak negative anomalies. 



Plates 16-40. — The curve-diagrams at the bottom on the left side. For ex- 

 planation see the text. 



Plates 15-41. The isopleth-diagrams at the bottom on the right side give the 

 anomalies of the surface temperatures in tenths of a degree Centi- 

 grade for each decade (I-VII) for the 4° longitude fields of the 

 shipping course Channel to New York. The heavy vertical numbers 

 give the positive anomalies, the lighter inclined numbers negative 

 anomalies. 



Plates 42 and 43. — Pressure gradient-curves and temperature-curves for the 

 10° longitude fields of the shipping course Channel to New York (see 

 also plate 15, 1-6) for the first decade group February 3 to March 4, 

 and for the second decade group March 15 to April 13. Curves B: 

 Anomalies of the relative numbers of the air pressure gradients for 

 the months January to March and the mean for January and February 

 (strong dotted lines). Curve W: Anomalies of the surface tempera- 

 ture for February 3 to March 4, and for March 15 to April 13. 

 Curves L: Anomalies of the air temperature for the same time as 

 for W. W-L: Anomalies of the difference surface temperature 

 minus air temperature for the same time as for W. For each tempera- 

 ture curve for each decade group mean values are given for the 

 series of years 1900-1910 under the headings W, L, and W-L. 



Plates 44 and 45. — Pressure gradient curves and temperature curves for the 

 southerly region Portugal to the Azores for the first decade group 

 February 3 to March 4. Explanation of these curves is the same as 

 for plates 42 and 43. 



Plate 46. — Air pressure gradient curves and temperature curves for the four 

 10° longitude fields of the Danish observational region for February 

 and for March 16 to April 15. Explanation of the curves is the same 

 as for plates 42 and 43. The curves L in the two lower diagrams give 

 the mean air temperature for Stornoway (Hebrides)., DeernesJ! 

 (Orkney), and Sumburgh Head (Shetland). 



Plates 47 and 48. — Air pressure gradient curves (B) and temperature curves 

 (W water, L air) for various stations on the Norwegian coast. 



