37 



Capillary Rise at Different Periods 



No 10 ma. 1 hr. 2 das. 7 das. 13 das. 27 das. 48 das. 

 Soil 



11.0 12.3 13.3 14.7 16.2 

 13.2 *14. 8 15.7 17.2 19.0 

 36.8 55.5 65.0 72.0 or top 



10.1 18.1 22.5 28.7 35.7 

 The coarse soils 1 and 2 show #the most rapid rice 



in the beginning, but fail far behind toward the end of 

 the experiment. Soil of medium t>»xture permits the water 

 to rise rapidly, diminishing toward the iact,«when it reached 

 the top of the cylinder. r^oubtlese in time the rie© would 

 have be©n eonsiderabiy higher had the column bsen longer. 

 Soil 4 showed a slow rise, and judging from the results 

 in capillar^ tests by the California Station, it is probable 

 that it would never have reached above 48 inches. Had it 

 been convenient to determine the rise in ffioi8ten*!id soil, 

 the capillary rise would have been greater and perhaps 

 the comparative results would have been eomewhiat different. 

 These differences, however, indicate the gr^at variations 

 in the capillary power of soils - differences which should 

 be eliminated as far as possible in experimental work. 

 When th-ii 4l^^ ^® P"^ under speeial stress, such as gro'iring 

 "weeds" in corn, the variations due to this cause might 



