224 
of that region to do in the way of defining local distribution. 
Although the author has shown a most commendable conserva- 
tism in refusing to include species whose occurrence or taxonomic 
status is doubtful, he does not seem to have overlooked any 
important source of information, or to have rejected any recently 
described species without reasons that seemed sufficient to him. 
Persons who contemplate doing floristic work on a similar scale 
elsewhere in the near future would do well to take Mr. Stone's 
work for a model, and not allow themselves to fall short of his 
ideals. 
From the little statistical summary on page 806 one can easily 
gather an interesting fact that is not mentioned anywhere in the 
book; namely, 36.6 per cent. of the angiosperms catalogued are 
monocotyledons. This is the largest proportion of monocoty- 
ledons in any equal area of dry land in North America, as far as 
known to the reviewer,* and indicates again the decided pioneer 
character of the vegetation of a large part of the area. 
The bibliography contains 92 titles, with extended comments on 
some of the papers, and references to biographical sketches of 
some of the earlier authors. It is arranged chronologically or 
nearly so, and is probably nearly complete for the ground 
covered. 
The index unfortunately is not up to the standard of the rest 
of the book, as it is almost confined to the accepted species in 
the taxonomic catalogue. Both technical and common names 
are included, but there is only one reference to each, synonyms 
seem to be ignored, and the species are not indexed separately 
except in a few of the larger genera. The names of botanists 
whose biographies are referred to in the same 666 pages, and some 
of the chapter headings in the first 100 pages, are also included. 
The bulk of the index would have been increased very little by 
including references to all the explorers of the region, especially 
those whose biographies are referred to in the bibliography; and 
perhaps not at all by including the plants mentioned in the 
introductory part. This, however, may be one of those too 
common cases where the index was prepared by some other 
person than the author. 
* See Torreya 5: 207-210. 1905. 
