62 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Hill, and other authors have overlooked it in making their compilations. 
The spelling of many names is different from that found elsewhere 
and there are some evident typographical errors, such as ‘*‘ diametro 
en pies,” which must be intended for inches, as well as impossible spe- 
cific gravities probably due to careless proof reading. On the whole, 
however, this anonymous contribution is an important one, and cer- 
tainly represents a large amount of work. Many of the names are 
not yet identifiable botanically and the data are in such cases placed 
with the Porto Rican designation. Credit is given to ‘“* Exp. 1857,” 
since a personal reference to the author is impossible. 
For data respecting the characters and uses of woods we have 
drawn very freely upon Grosourdy’s rare and valuable work on West 
Indian. botany. 
The native names used in the publications of Mr. Robert T. Hill, 
as well as those appearing in other recent works upon Porto Rico, 
have also received consideration, with the intention of rendering as 
definite as possible the information which has been collected. 
PERSONAL FIELD WORK, ACKNOWLEDGMENTS, AND DESIDER- 
ATUM. 
The writers made two trips to Porto Rico, one in 1899, the other in 
1901, which covered the different types of floral and asticulaem areas 
of the island. The specimen numbers cited in the catalogue refer to 
the collections made on these visits. 
In the labor of compiling data from these and other sources we 
have received much friendly assistance from Messrs. Henry E. Baum, 
Edgar Brown, and William R. Beattie, of the Office of Botanical 
Investigations, Department of Agriculture, to whom our thanks are 
tendered herewith. 
Not all the native names of woods and other plants have yet been 
identified botanically, and authentic flowering or fruiting specimens 
of such will be welcomed by the authors. Such specimens for identi- 
fication should be of reasonable size—that is, 12 or 15 inehesin length— 
and should be pressed and dried before mailing, otherwise they may 
arrive in a decayed condition and utterly worthless for study. With 
correspondents who will take the trouble to prepare good specimens of 
economic plants and information concerning their local names and 
uses, arrangements will be made for the transportation of packages 
without cost to the sender. 

“Grosourdy, René de, M. D. El médico botanico criollo. 1864. 4 vols. 

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