26 



Guayule. 



TABLE 4. 



Two adjoining quadrats, each of 100 sq. meters, on a loma or ridge extending 

 toward the Sierra Zuluago, about 10 miles north of Cedros (plate 5, fig. A). All the 

 plants were pulled up and sorted, each package containing plants of similar size and 

 habit. The packages were then grouped into classes arbitrarily, and a typical plant 

 for each class photographed (plate 6) . The age of this plant was carefully estimated 

 and checked by estimating the ages of a number of similar plants. (March 29, 1908.) 



1 685 plants in 100 square meters. 



Class V is made up of all sizes up to the maximum indicated. In plate 

 6, figs. 5 to 7, examples of three sizes and ages are shown. The weights 

 and estimated ages of all the plants in plate 6 are shown in table 5. 



TABLE 5. 



