1$. p. I.— 117. c. F. r. I.— inc. 



RANGE INVESTIGATIONS IN ARIZONA. 



INTRODUCTION. 



Tlu^ discussions of the foUowirii.;- i)a_u'es aro based upon experimental 

 work and observations made in the Territory of Arizona between the 

 months of Autiust, liXio. and November, iHO^.in cooperation witii tiie 

 Arizona Experiment Station. The experimental work tluis far has 

 I)een conducted upon the small inclosure near Tucson, a discussion of 

 which was the main feature of liuliclin 4: ot this series. Such data 

 reuardino- this work as were not included in that ])ublication arc dis- 

 cussed hei-e. The opportunities of the writer for ol)servation of the 

 conditions obtainino- throughout the main ^^-razin^ ureas ha\-e l)een very 

 good, especially during a residence of an academic year at Tucson in 

 190(»-r,t(H and during the si)ring. summer, and autumn of 190:^. 



Besides visiting the region within (><> miles of Tucson at all seasons 

 of the year, the following list of trips over the ditl'erent j>ortions of 

 the range country is appended for the purpose of tixing more definitely 

 the time at which these observations were made, as well as to make 

 the data accompanying the rather large collections of forage and other 

 plants secured upon these several journeys and afterwards deposited 

 in various herbaria more complete: 



October fi to 19, li)00. Tucson to Wilcox via Benson, and rctm'n via Pearce and 

 Tombstone. 



December (i to 2;!, 1900. Maricopa to Tempe, and return to Picacho via Meisa and 

 Florence. 



March 17 to 22, 1903. Tucson to Laosa via Sopori and Arivaca, and return via 

 Babuquivari Mountains and Robles. 



March 24 to 30, 1903. Tucson to Dudleyville via Willow Spring Mountains, and 

 return via San Pedro and across the Rincon Mountains to Tanque Verde. 



April 7 to 15, 1903. Tucson to Xogales, and return to Phoenix via Arivaca, ("oyotc, 

 Santa Rosa, and Casagraude. 



May 15 to 18, 1903. Williams to Bright Angel and return. 



June 29 to July 8, 1903. Huachuca Mountains to Cannanea, Sonora, Mexico. 



July 16 to 17, 1903. Prescott to Mayer. 



July 18 to 19, 1903. Ash Fork and Williams. 



July 20 to 23, 1903. Flagstaff and south to Mogollon Mountains. 



July 25 to 26. 1903. Winslow and Holbrook. 



August 8 to 17, 1903. Adamana to Fort Apache via Long H ranch and St. Johns, 

 returning via Showlow. 



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