12 BULLETIN 1050, U. S. DEPARTMENT OF AGRICULTURE. 
fig. 6), but may be absent for areas of several square inches. Under 
a magnifying glass it can be seen that these white lines are made up 
of rows of ducts (smaller than the pores) containing a white gum, 
differing in this respect and in not being continuous from the light- 
colored lines: found in true mahogany. These tangential rows of 
white gum ducts are found in no other species sold as mahogany, 
unless it be in other species of the Dipterocarp family which may 
occasionally be included in shipments of " Philippine mahogany." 
Short lines of lighter colored tissue extending for a short dis- 
tance tangentially from the pores may occasionally be seen with a 
lens on smoothly cut end surfaces. It is not necessary to look for 
these, however, in distinguishing " Philippine mahogany " from other 
species herein described. 
The rays are not visible without lens on an end section, but are very 
conspicuous on radial surfaces because of their reddish color. 
No well-defined growth rings are present, although the rows of 
gum ducts when long might be mistaken for the termination of 
seasonal layers. 
" COLOMBIAN MAHOGANY." *> 
(Cariniana pyrifornvis Miers.) 
Monkey-pod Family (Lecythidace^e.) 
other names. 
Cariniana, albarco (Colombia). 
WHERE GROWN. 
Colombia, South America. 
PHYSICAL PROPERTIES. 
The wood has about the same weight and color as moderately heavy 
mahogany, except that a slight purplish tinge is usually present. 
It has more or less interlocked grain, but is said not to give any 
trouble by warping when properly seasoned. 
STRUCTURE. 
The pores are visible without a lens on smoothly cut end and 
longitudinal surfaces. They are fairly uniform in size, and evenly 
scattered, singly or occasionally by twos. They do not contain 
brownish gum, as do those in true mahogany, but contain some 
tyloses. The growth rings are ver}^ faintly defined by a slight 
difference in the size of the pores. 
20 See Forest Service Circular 185, " Colombian Mahogany," by Geo. B. Sudworth and 
C. D. Mell. Government Printing Office, Washington, D. C. Price, 5 cents. 
