THE SEASONS. 



41 



hu-oor. Nearly all (trasses are in Inmches and often grow 2 or 3 feet 

 hijili, but always scattering-. It is only in favorable depressions, where 

 the land gets an increased ([uantity of moisture that there is a sufficient 

 amount of development to produce a complete ground cover. The 

 summer season of growth depends not only on the amount of rainfall. 

 ])ut upon its distribution during the period from July to September. 

 The following table of rainfall, prepared from Weather Bureau 

 observations at Tuscon during the years Ii>(»2and l!»<t;3, illustrates very 

 nicely the ditlerence ])etween what are considered years of plenty and 

 years of famine in the range business in this region: 



Table showing differetm- in mnoind and diatrilmtlon of prcri^nlalion in a good and iu a 



poor season. 



[I'recipitAtion expressed in inches.] 



