Xll 



PREFACE 



the desert, freely put at my disposal, was invaluable 

 in revising the Appendix of Plants. I am indebted 

 also to the United States Geological Survey for per- 

 mission to reprint from one of their publications the 

 "Hints on Desert Travelling " that appear in Appen- 

 dix A. 



In conclusion, it is most satisfactory to note that, 

 since the following chapters were prepared, the 

 United States Government has, by a small appro- 

 priation of funds, made at least a beginning towards 

 bettering the conditions of desert travel by the 



marking of roads and water-holes. 



J. S. C. 

 Palm Springs, California 

 November, 191 8 



