190 



BOTANICAL GAZETTE 



[march 



plant roots, while not recognizing the wilting coefficient, practically 

 ceased to withdraw water as soon as the hygroscopic coefficient 

 had been reached. There was little difference in moistness between 



TABLE III 



Monthly precipitation in inches at McCook, Wauneta, Imperial, and 

 THE H. O. Ranch, showing dryness of seasons 



Month 



Normal 



McCook 



Wauneta 



Imperial 



1910 



McCook 



Wauneta 



Imperial 



H. O. Ranch 



January. . . 

 February. . 



March 



April 



May 



June 



July 



August .... 

 September . 



October 



November . 

 December. . 



Annual 



0.21 

 0.62 



0.73 

 1.89 

 2.82 



3-29 

 3 09 



2.SS 

 1.72 

 1.03 

 0.56 

 O.S7 



26 

 69 

 03 

 04 

 54 

 34 

 47 

 74 

 1-3S 

 I 13 

 0.39 

 0.57 



0.44 

 0.69 



1-33 



2.27 

 2.82 



3-34 

 2.91 



2-73 

 1-34 

 1. 10 

 0.50 

 0.72 



0.0 

 0.0 

 0.0 



0.76 



2.77 

 1 .12 



0.0 

 0.0 

 0.0 

 0.82 

 2.00 

 •44 



70 



93 



72 



17 

 o 



17 



77 



64 



20 



o 



10 



0.8s 



0.40 



O. 10 



0.38 

 0.71 

 1.98 



2.51 

 0.72 

 2.82 



i.S8 

 T 

 T 



0.57 



19. 08 



18. SS 



20. 19 



9-34 



13.82 



11.77 



35 

 06 



36 

 60 



25 

 24 

 0.34 

 0.97 

 1.28 

 0.0 

 0.03 

 0.14 



7.62 



the surface foot and the succeeding 2 or 3 ft., and even the deeper 

 subsoil was but little if at all moister. At no level and in none of 

 the fields was there any growth water, the moisture content being 

 below the computed wilting coefficient, which corresponds to a ratio 

 of 1.47, or approximately 1.5 (6). 



