568 



STATE BOARD OF AGRICULTURE. 



Table 3.— Concluded. 



Percentage of moisture. . . 

 Frteiing point depression 



Farts per million 



Osmotic pressure 



Perceatage of moisture. . . 

 Freezing point depression 



Parts per million 



Osmotic pressure 



Kentucky 



Marshall 



silt loam 



(43) 



14.37 

 .785 

 19,150 

 9.454 



37.89 

 .021 



512 

 .253 



Florida 



Prairie 



sand (49). 



Kentucky 



Miami 



silt loam 



(44) 



6.98 

 .040 

 15,610 

 7.710 



25.48 

 .031 



756 

 .374 



5,16 



.183 

 4,463 

 2.207 



22.45 

 .010 



244 

 .121 



Cal. Chino 

 silt clay 

 loam (50). 



22.46 

 .920 

 22,440 

 11.08 



37.26 



.089 

 2,171 

 1.073 



Percentage of moisture. . . 

 Freezing point depression 



Parts per million 



Osmotic pressure 



Kentucky 

 Carrington 

 loam (45). 



15.26 

 .672 

 16,390 

 8.095 



38.48 

 .019 



463 

 .229 



California 



Ramona clay 



loam (51). 



Kentucky 



LaCrosse 



silt loam 



(46) 



8.23 



.423 



10,320 



5.098 



24.86 

 .044 

 1,073 

 .530 



17.52 



.667 



16,270 



8.035 



30.11 



.060 



1,463 



.724 



Cal. Oakley 



fine silt 



loam (55). 



7.68 

 .399 

 9,731 

 4.809 



16.28 

 .028 



683 

 .350 



California 



Holland 



loam (52). 



8.79 

 .763 

 18,610 

 9.190 



25.14 

 .013 



317 

 .157 



Quartz 

 sand (56). 



1.50 

 .070 



1.70.J 

 .844 



15.0 

 .007 

 .170 



Florida 

 Prairie 



saud (47). 



4.00 



.290 

 7,073 

 3.496 



24,06 

 ,022 



537 

 .265 



Cal. Hartford 



fine silt 



loam (53). 



7.09 



.200 

 4,878 

 2.412 



25.42 



.025 

 610 

 .301 



Muck (57). 



75 07 

 .470 

 23,500 



.034 5.661 



134,39 



,048 



2,400 



.578 



Florida 

 Prairie 



sand (48). 



5 23 

 .110 



2,683 

 1.329 



23.98 

 .029 



707 

 .350 



California 



Galo fine 



silt loam 



(54) 



6.87 



.242 

 5,902 

 2,917 



19,65 

 .025 



610 

 .301 



Peat (58). 



61.28 

 .420 

 23,333 

 5.062 



203 54 



.040 



2,222 



.482 



The data presented in the above table agree exactly with the similar 

 results obtained in the first investigation. They show (1) that the loAver- 

 ing of the freezing point of soils is entirely different at tlie opposite 

 moisture contents in all the different soils; (2) the degree of the depres- 

 sion is rather small at the high moisture content and varies quite ap- 

 preciably in the different soils, Avhile at the low moisture content it is 

 tremendously high and varies considerably in the various soils. At the high 

 moisture content the lowering of the freezing varies from .010 °C in the 

 case of sands to .075°C in the case of some clay loams and clays, while 

 at the low percentage of moisture it ranges from about .110 °C in some 

 of the sands to about 1.370 °C in some of the loams and clays. The de- 

 gree of depression for heavy sandy loams, silt loams, clay loams, and 

 clays tends to be above 1°C at the minimum water content, while that of 

 sands and very light sandy loams lies as a rule close to 0.4°C. The 

 percentage of moisture of the quartz sand, many of the sands, and light 

 sandy loams at the minimum water content at which these small depres- 

 sions were obtained is extremely low, only a little above the hygroscopic 

 point. Thus, the percentage of moisture of the quartz sand and one of 

 the sands is only 1.5 and 2.43 respectively. Yet at this extremely low 

 water content the quartz sand gave a depression of only .070°C and the 

 sand .380° C. While the percentage of water in the loams, silts, and clays 

 at the minimum percentage of water at which the great depressions were 

 obtained, is com])ara lively very high. Thus, the Kentucky Carrington 

 clay loam and the IMinnesota clay contain 39.28% and 22.39% of mois- 

 ture respectively. Yet at this apparently high moisture content the 

 lowering of the freezing point of the Kentuckv Carrington clay loam is 

 1.075°C and that of the Minnesota Clay .987°C. 



The significance of the differences in the moisture content and the 



