vi Peeface. 



and the consequent necessity of lieing in ninny places at ahout the same time, 

 and it can In- readily nndov^toixl that tlie tield w.;.rlv ('onld nnt be aecomidished 

 in one or even nxo sca-ini?. Imleed. it has requireil several iin're than that. 

 Xothins but a love of the iiibject would forrifv ..ne witli tlic required patience. 



The ueces-ity of visitini;- the trees in their native haant~ is evident. This 

 has brought me much in contact witli tlie country folk in remote regions and 

 has been associated with many novel and generally pleasant experiences. The 

 visit of an " outsider " ofttimes seemed as welcome an occasion to them as the 

 opportunities of their respective localities, and often contact with them, were 

 enioved bv me. and I gratefully remember many acts of kindness in these 

 hospitable people. 



Occasionally it was my av'od feirtuue to have the companv of fellow liotanists 

 in the tield and enjeiy the benctit< of their familiarity ^\-ith the trees ^^if their 

 respective regions. Sucli was my experience in studying the interesting trees 

 of Stateii Island with ]\Ir. AYm. T. Da^ds. for Avhose as^i^tance I am very 

 grateful. 



A rare treat I friuiid in *t':ire when I dr^ipped in U]i(:in Prof. T. D. Beadle, 

 botani.-t, at Biltmnre, X. ('., and enjoyed a few days" Mijourn with liiin we.rking 

 lip certain -pedes of the Alleghany ^lonntains, and to Professor and ]Mrs. 

 Beadk' I am under lasting obligation. 



Fur able couu-el and a~sistaiice in many ways I am indebted to mv o-nod 

 friend. Prof. AVm. Trelease, dirci'tiu' ]\Iissiuiri Botauii^al Garden. Tri Pr. X. M. 

 Glatfelter. whose familiarity with the AVillows of ^lissouri was i-if material 

 assistance to me, I am likewise gratefuk So, too, to I\Ir. G. AV. Letterman. with 

 whom I made several visits to the valley of tlie Alerrimac Piviu-, A[o. I wish 

 to acknowledge favors extended b\- ^Ir. ('. ( '. Laney and Air. .Pihii Dunbar, of 

 Rochester, Prof. V. IT. I'eck. of Alliany. ami .Mr. .T. G. Tack, of the ArmTd 

 Arb(-jrctum, in assistance to material ilbistrative of various s]-iecies of C'rata"><i-ns 

 of tlieir resiiective regions. To Mr. E. P. C!ap]i, Rev. E. T. Hill, Dr. T. 

 Sclmeck, ^Sh: H. X. Patter-on, Prof. B. O. Tr.ngvear. Prof. \V. A. Buckliout, 

 Prof. A. T. Erwin. Air. V. R. Gardner, Air. E, S. Steele. Mr. V. E. 

 Bovntou. Air. T. G. Harbison. Dr. R. A!. Harper. Air. B. T. Gault. Air. F. K. 

 Baltliis. :Mr. A. .1. Tolmsrni and Air. T. C. Tea-, T wi-b also to eximd tlianks 

 for assistance. Ta-^t, but by no means least, I gratrfiillv ackuowk'do-,' ciumsel 

 and facilities extended iu tlie use of lirrbarium material b^■ Air. Gilford Pinchot, 

 Fori'ster, and Air. G. B. Sudworili. Di-iidr.i],,o-ist of ;he V. S. Forestrv Service; 

 by Dr. T. X. Ros,. of rlic Xatioual llorliariuui, and bv Dr. X. S. Britton. 

 Director of the Xew York Britanival Garik^n, 



Data as to s]iecitic gravities of woods has Iveen taken from tlie Rrjiort of 

 Tenth Gensiis of the Fnitrd SimVos. ;md rejuvsent in each case ihe avorac'e of 

 two ,ir more determinations with ab-olutely dry wood taken from dilferent trees. 



LowviT.LE. X. Y., Jmir 29, ITiOT. 



