222 FARM GRASSES OF THE UNITED STATES 
The results obtained by applying all these rules to 
two ricks of different form are given below. 
Rick A Rick B 
Hight Ct.) se ce ses cee ee cae ose cs g.0 12.0 
Wadtl (ft.)- 5. ke ae ase) 7 a oe es 12.0 12.1 
Over (fh) a var aw eo ce, a Oe 23.88 25.2 
Volume—true (cubic ft.) . . . . . 2,534.4 3,084.0 
Volume—First rule (cubic ft.) . . . 2,149.2 2,559.1 
Volume—Second rule (cubic ft.) . . 2,138.4 2,922.1 
Volume—Third rule (cubic ft.) . . . 2,553.0 3,087.0 
PER CENT. OF ERROR 
Firse rile: ao. se Go Ne ce ce ae I4.u 17.0 
Second rulé.. 6 a we ke ew 15.6 5.2 
Third vule: 2) ws me we ey, I 
These two ricks were measured with the utmost 
care. It will be noticed that A is three-quarters as 
tall as wide; it was also quite round. Ais as tall as 
wide, and narrow topped—a very common form. The 
rule last given is seen to give very accurate results in 
both cases, while the other two give values much too 
small. In both cases the New Mexico rule gives large 
errors, the error being in favor of the buyer. The 
second rule gives a value much too small in the case 
of the low, round rick, but is more nearly corect for 
the tall, sharp-topped one. 
No satisfactory rule for finding the volume of a 
round stack has yet been published, and the writer has 
not had time to develop one in his own investigations. 
The volume of such a stack may be found in the fol- 
lowing manner, which, however, is too tedious to be 
practicable: Measure the circumference of the stack at 
each foot of its hight. Square each of the numbers 
