APPENDIX 

 LABORATORY PRACTICE 



THE following eighteen experiments, some of which have 

 more than one part, are prepared to demonstrate some of 

 the more important facts concerning soil conditions and 

 drainage, and these are likely to suggest others to both 

 teacher and student. They have been used, slightly 

 modified in some cases, by the writer. 



EXPERIMENT 1 



Distribution of Capillary Water in Columns of Soil 



(A) The material required for this experiment consists 

 of: 



1. A number of threaded 6-inch sections of IJ-inch 

 brass tubing as illustrated in Fig. 91. 



2. Three-inch circular filter paper. 



3. Small pieces of strong cheese-cloth, 4 inches square. 



4. Light strong cord. 



5. A small strong granite-ware pan with creased 

 bottom. Instead of a granite-ware pan, a small block of 

 some non-absorptive material may be used. 



6. A f-inch round soft-wood rod, 10 or 12 inches long. 



(B) To perform the experiment : 



1. Carefully vaseline the base of the threads of twelve 

 of the threaded sections of tubing and screw them to- 

 Q 225 



