WEATHER BUREAU. 163 



equation. A copy of these tables has already been requested by the 

 Argentina Meteorological Office. 



It is believed that accurate determination of the intensity of direct 

 solar radiation, of the quantity of heat received diffusely from the 

 whole sky, and of the rate at which heat is lost at night will not only 

 be of value to climatologists generally, but will also be utilized by 

 the weather forecaster. Especially urgent is the demand from biolo- 

 gists for accurate data relative to the quantity of heat received from 

 the whole sky. The University of Wisconsin is now furnishing data 

 of this character for use in connection with certain biological studies. 



MOUNT WEATHER BULLETIN. 



A full discussion of the upper-air observations made at Mount 

 Weather and elsewhere, as well as of the progress made in other 

 special lines of scientific work, will be found in the successive issues 

 of the Bulletin of the Mount Weather Observatory, which, it may be 

 remembered, is devoted to the results obtained from aerial investiga- 

 tions as well as from other special researches into obscure laws of 

 atmospheric phenomena bearing on the physics and mechanics of the 

 whole atmosphere. Although this publication is mostly filled by the 

 results contributed by the staff of the observatory, yet, when space 

 allows it, contributions of fundamental importance presented by other 

 meteorologists are included in the Bulletin. 



The completed Volume II, with its index, was issued in July, 1910, 

 and the completed Volume III, with its index, in July, 1911. The 

 second part of Volume IV was sent to the printer in June of the 

 present year. 



FOKECASTS AND WARNINGS. 



The work of forecasting daily weather and temperature changes, 

 storms, cold and warm waves, and frosts — the primary duty of the 

 Weather Bureau — received the careful attention of the corps of fore- 

 casters throughout the year. No important meteorological change 

 occurred without notice having been given well in advance. 



Storm warnings to Lake, seacoast, and West Indian stations, and 

 frost warnings for the sugar, trucking; tobacco, fruit, and cranberry 

 regions, were issued whenever conditions justified. These warnings 

 were successful. Particular attention was given to the hurricanes of 

 September and October, 1910, and a number of testimonials com- 

 mending the work of the bureau in connection therewith were received. 

 The warnings of the approach of cold waves resulted in a saving of 

 growing crops and prevented injury to many shipments of perishable 

 goods and to farm stock. Daily forecasts of probable wind and 

 weather conditions off the Atlantic coast, eastward to the Grand 

 Banks, were issued for the guidance of transatlantic steamships. 



HURRICANES OF THE YEAR. 



West Indian hurricane of September, 1910. — This storm was 

 first detected near San Juan, P. R., on September 6. It moved in a 

 west-northwest direction, and by the morning of September 14 had 

 reached the Texas coast near the mouth of the Rio Grande. Warn- 

 ings were issued regularly until the storm disappeared. No loss of 



