TEMPERATUEE OF SOIL AS MODIFIED BY 

 CFIEMICAL COMPOSITION^ 



ABSTRACT OF AN ARTICLE PUBLISHED IN THE REPORT OF THE STATE 



BOARD OF AGRICULTURE FOR 1868. 



BY R. C. KEDZIE. 



Tnese experimental investigations consisted of a series of observations, by 

 means of thermometers placed in the soils, and the observations taken thrice 

 daily, from the first of May to the 30th of Sej)tember. The soils nsed were 

 tile clay taken from the subsoil ; sand, such as is used for making mortar, 

 and f]'eed from all foreign matter, by washing; tile clay and 12 per cent, 

 humus; sand and 13 per cent, humus; and humus. Each kind of soil was 

 placed in a separate box; the several boxes being separated by hollow walls 

 to prevent the lateral communication of heat. The thermometer bulbs 

 were buried two inches deep in each soil, and the stems projected hori- 

 zontally from the side of the box, so that the temperature could readily 

 be read from the thermometer scale. The observations were taken at 7 a. 

 M., 2 p. M., and 9 p. m. These observations and the results are contained 

 in the following table : 



SUMMARY OF RESULTS OF TRI-DAILY OBSERVATIONS ON SOIL TEMPERATURE FROM 



MAY TO OCTOBER, 1868. 



