4 EXPLANATION 



The maps are designed to give the best information 

 now obtainable on the subjects mapped. The map showing 

 grass societies is a correction of that pubHshed in Bulletin 

 Number 66 of this Station, and is in the opinion of the au- 

 thors as accurate as such a map can be made on so srrtoll 

 a scale. It must be understood that all the maps are tentative 

 and simply represent progress to the present time. 



The relief map is a decided improvement over that 

 published in Bulletin Number 66 and is included to show the 

 more prominent relief features of the State because they 

 are more important as regulating the climatic conditions of 

 the State as a whole than any one other factor. Of course 

 this map has numerous inaccuracies which will no doubt ul- 

 timately be corrected. It was prepared from the best data 

 obtainable under the direction of one of us. 



The zone map is a copy of one prepared in the Bureau 

 of Biological Survey, Washington, D. C, by Mr. Vernon 

 Bailey, who, with his assistants, has been working at this 

 subject for a number of years : the result speaks for itself. 

 Our copy is but a poor imitation of their finely colored map, 

 but will no doubt serve all that is here required. 



The figures are copies of lithographs made in what was 

 the division of Agrostology, United States Department of Ag- 

 riculture, either by or under the direction of Dr. F. Lamson- 

 Scribner and are the best that have so far been produced. 



A paragraph on "How to use the Keys" precedes the 

 first key, and an explanation of the various technical terms 

 used in describing a grass with an illustrative diagram of 

 a grass is also given. Descriptions of the characteristics 

 of the grasses (Gramineae) the sedges (Cyperaceae) and 

 the rushes (Juncaceae) precede the keys to these famil'.es 

 in the order named. 



