_ 12 BULLETIN 1010, U. S. DEPARTMENT OF AGRICULTURE. 



is Weather Bureau. U. S. Climatological data of the United States. A monthly 



record by sections— States— issued since Jan., 1914, mainly of tempera- 

 ture and precipitation data for each station reporting to the Weather 

 Bureau. Prior to L914, all similar data were published in the Monthly 

 Weather Review. Current conditions are given, as well as variations 

 from the normal for stations established 10 years or mor< 

 19. Zon, Raphael. Meteorological observations in connection with botanical 

 geography, agriculture, and forestry. U. S. Weather Bureau, Mo. 

 Weather Rev., XLII, 4, 1914. 



AIR TEMPERATURES. 



21. Fassig, 0. L. Period of safe plant growth in Maryland and Delaware. U. S. 



Weather Bureau, Mo. Weather Rev., XL, 3, 1914. 



22. Hartzell, F. Z. Comparison of methods for computing daily moan tempera- 



tures: effect of discrepancies upon investigations of climatologists and 

 biologists. N. Y. Agr. Exp. Station Bull. 68, L919. Abstracl in Mo. 

 Weather Rev., p. 799, Nov., 1919. 



23. Koeppen, Vladimar. A uniform thermometer exposure at i Meteorological sta- 



tions for determining air temperatures and atmospheric humidity. 

 U. S. Weather Bureau. Mo. Weather Rev., XLIII, 8, L915. 



24. Lehexbauer, P. A. Growth of maize seedlings in relation to temperature. 



Physiological Researches, I, 5, pp. 247-288, Baltimore, L914. 



25. Livingston, B. E., and Livingston, G. J. Temperature coefficients in plant 



geography and climatology. Bot. Caz. 56, pp. 349 375, L913. 



26. Livingston, B. E. Physiological temperature indices for the study of plant 



growth in relation to climatic conditions. Physiological Researches, 

 1:8, 399-420, 1916. 



27. MacDougal, D. T. The auxothermal integration of climatic complexes. Amer. 



Jour. Bot., I : 186-193, 1914. 

 2£ Marvin, C. F. Instructions for obtaining and tabulating records from recording 

 instruments. U. S. Weather Bureau, Circular A, Instrumenl Div., L913. 



29. - Sluggishness of thermometers. V . S. Weather Bureau, Mo. Weather Rev.i 



XXVII, 10, 1899. 



30. Merriam, C. Hart. Life zones and temperature zones. L898 



31. McLane, F. T. A preliminary study of climatic conditions in Maryland as 



related to plant growth. Physiological Researches 14. (Baltimore) 

 February, 1917. 



32. Sampson, A. W. Climate and plant growth in certain vegetative associations. 



I'. S. Dept. Agr. Bull. Xo. 700, 1918. 



33. Seeley, D. A. Instruments for making weather observations on the farm. U. S 



Dept. Agr. Yearbook, 1908, pp. 433-442. 



34. Shreve, Forrest. The influence of low temperatures on the distribution of 



the giant cactus. Plant World, 14, 6, 191 1 . 



35. Cold air drainage. Plant World. 15, 5, 1912. 



36. Shreve, Edith B. Thermo-electrical method for the determination of leaf 



temperature. Plant World, 22, 6, 1919. 



37. Standards, U. S. Bur. of. Testing of thermometers. Circ. No. 8, 1911. 



38. Thiessen, A. H. Story of the thermometer and its uses in agriculture. I - 



Dept. Agr. Yearbook, 1914, pp. 458-461. 



39. Weather Bureau, U. S. Instructions for cooperative observers of the Weather 



Bureau. Circs. B and C, Instrument Div., 1915. 



