222 FASM GRASSES OF THE UNITED STATES 



The results obtained bj- applying all these rules to 

 two ricks of different form are given below. 



Rick A Rich B 



Hight(ft.) 90 12.0 



Width (ft.) 120 12.1 



Over (ft.) 23.88 28.2 



Volume — true (cubic ft.) . . . 2,534.4 3,084.0 



Volume — First rule (cubic ft ) . 2,149.2 2,5591 



Volume— Second rule (cubic ft.) . . 2,138.4 2,922.1 



Volume — Third rule (cubic ft.) . . . 2,553-0 3.0S70 



PER CEXT, OF ERROR 



First rule i4-o l7-o 



Second rule . . 15-6 5-2 



Third rule -7 -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. B is as tall as 

 wide, and narrow topped — a ven,' 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 Xew Mexico rule gives large 

 errors, the error being in favor of the buj-er. The 

 second rule gives a value much too small in the case 

 of the low, round rick, but is more nearly corecl for 

 the tall, sharp-topped one. 



No satisfaAory 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 maj- be found in the fol- 

 lowing manner, which, however, is too tedious to be 

 pradlicable: Measure the circumference of the stack at 

 each foot of its hight. Square each of the numbers 



