69 



lower altitudes — that is, up to 1,000 meters aboTe the sea. In this first al- 

 titudinal section tlicre are found in the neighborhood of i)00 distinct tree 

 species ; in the second there is a very perceptii)le decrease in the number of 

 individual tree species ; in the third this decrease becomes very strongly 

 marked; and in the fourth or al))in(' region l)ut fifteen or twenty tree 

 species are found, and these much stunted in growth. 



When a type area is selected for study, a bivouac is established and a 

 careful preliminary survey is made. After a thorough examination of the 

 proposed area, the work of numbering the trees is commenced, and as 

 each tree is numbered a printed slip or field label, with blank spaces, is 

 filled out and afterwards filed with the botanical specimen, giving all the 

 information oblaiiuible regarding the tree, its name, economic uses, char- 

 acter of the bark, wood, etc. Any peculiarities regarding habit, foliage, 

 flowers, or fruit, and the height and diameter are, whenever possible, care- 

 fully measured. Careful, and if possible complete, botanical specimens 

 are prepared at the same time, bearing the distinctive number and plot 

 letter of the tree, and these botanical specimens, together with the notes, 

 are carefully preserved in the museum for further study. At the time the 

 trees are numbered a sketch map is also made showing the position of the 

 bivouac, the inspection paths, and the position of each numbered tree 

 with its distinctive number and letter, and further, a careful catalogue is 

 compiled, giving, first, the distinctive number and letter of each species; 

 second, the native and Latin names, if known; third, the height of the 

 tree in meters; fourth, its diameter in centimeters, measured at a height 

 of 1.33 meters above the ground ; and, fifth, a description of the exact 

 locality of each labeled tree. 



FORM OF REGISTER FOR A TYPE AREA. 



Register of the trees and other plants which have been labeled for the 



forest tlora investigations in the ty{)e vegetation area, Island 



of , Province of , town of 



Plot Xo. 1.— Altitude 1 to HOO meters. 

 [N me of ini> distinctive geographical feature— mountain, valley, river, lake, etc.] 



