14 BULLETIN S35, I*. S. DEPAP.TMEXT OE AGRICULTURE. 
In fai as the writer know-, there is very little knowledge of 
fch iive effect of these different factors upon the movement of 
. meral information being limited to the fact that they 
do in " the movement. There are a few data upon the quinti- 
: .-" . " (2) and some of the other mel jical 
factoi ind also or the soluble salts (3), but they are incomplete n 1 
osi inces confusing. In the experiments herein discussed, the 
evaporation factor has been controlled and taken into account w;; 
rtain : .::- = :.ad the results of this work vdil be discussed later in 
report 
In any comparison of the data from one soil with the data ob- 
tained from a different soil none of these factors has been taken into 
account. Chemical and mechanical analyses of the soil can be ob- 
. ined readily, but with our present knowledge such information 
would be of no service in making quantitative comparisons. For in- 
-: b: The colloids influence the movement of capillary moisture in 
one way. while the organic material, as indicated by the organic 
bon. exerts an influence in the opposite direction, There is not suffi- 
cient information to indicate in the least to what extent these two 
. . ■ rs might compensate, if at all. Other factors cend to retard the 
movement of the moisture, while others, again, tend to. augment it. 
hat extent our present information does not indicate. 
The experiments herein recorded were run at various times 
throughout the year and in the open. Some of the soils were rested 
during the heat of August and others during the cold weather in 
uary. Others of the soils were tested at a time when they en- 
inl _ I peri ds of almost extreme heat and extreme cold. It is 
a wn with reasonable certainty that the rate and extent of move- 
i of soil moisture is greater with temperature above but nea: 
ircczing point than at a higher temperature. That a temperature i 
i tn 26 c to 32 c F. has a marked influence upon soil moisture other 
than the mere fact of freezing will be indicated by data presented 
later in this report. 
In the data herein presented, no corrections are attempted for 
temperature or other factors unless specifically stated. It must be 
kepi in mind that in the calculations for comparison and in the 
derivation of formulae the conclusions reached are applicable only 
to the soil under consideration and under the same conditions. 
.MOVEMENT OF MOISTURE IX VERTICAL TUBES FROM FREE WATERS. 
The experiments herein recorded differ from other work that has 
been done in vertical tube- only in that the tubes are larger and the 
work has been carried to a greater extent (3), (1-k (13), (14). 
Tuese tul ss or flume- have also been subjected to variations of tern- 
