414 
FOXWORTHY. 
Table of comparative weights of eastern woods — Continued. 
Very heavy. 
Heavy. 
Moderately heavy. 
Light. 
Sp. gr., 0.90 or more: 
900 kilos or more 
per M 3 : 56 lbs. or 
more per cu. ft. 
Sp. gr., 0.70-0.90:700- 
900 kilos per M 3 : 44- 
56 lbs. per cu. ft. 
Sp. gr., 0.50-0.70: 500- 
700 kilos per M 3 : Si- 
ft lbs. per cu. ft. 
Sp. gr., 0.50 or less: 500 kilos 
or less per M 3 : SI lbs. or 
less per cu. ft. 
Moka. ” 
Kolavu. “ 
Mango. a 
Hernandia peltata. 
Culis. 3 
Lanotan. 
Mayapis. 
Khair. 11 
Leban. b 
Narra. 
Longan. 11 
Mahogany. a 
Nato. 
Cangu. ■ 
Macaasin. 
Nangka. 1 
Thitya. “ 
Mangaehapuy. 
Palo maria. 
Talura. » 
Molave. 
Pili. 
Thitsi. a 
Neaun. “ 
Mahogany.' 1 
Nireh. 11 
Renghas. * 
Padauk. 1 
Sacat. 
Pagatpat. 
Santol. 
Petir. 
Talisay. 
Rassak. 
Tamayuan. 
Sal. a 
Tanguile. 
Piagao. *> 
Teak. 
Siris. a 
Toog. a 
Sissoo. a 
Thinkadu. a 
Supa. 
Silky oak. “ 
Tindalo. 
Thingan. a 
Trincomali. “ 
Tucan-calao. 
Ubar 
Kumpas. 
a These woods are placed according to their arrangement in Gamble, l. c. 
b These woods are placed according to information given in Van Eeden, l. c. 
Hardness . — It is much more difficult to get a satisfactory measure of 
hardness than it is to get the weight. No completely satisfactory method 
of determining relative hardness has come to my notice. There are, 
however, certain comparative values recognized and these I have en- 
deavored to show in the following very imperfect table. I have been able 
to use only five categories, viz, very hard, hard, moderately hard, soft and 
very soft. Those woods classified by Gamble as extremely hard and 
extremely soft will naturally come under the very hard and very soft 
classifications in this table. 
Many of the very hard and very heavy woods are very dark in color. 
In these cases the sapwood is usually very much lighter in color and 
weight and is softer. In these woods it is the deposit of the dark-colored 
substance in the wood elements when the sapwood changes to heartwood 
that causes the hardness and weight. This is, of course, not the sole 
cause. There are some woods where the sap and heart are not noticeably 
different in color. In these cases, there is very little difference in weight 
and hardness in the different parts of the tree. If such woods are heavy, 
it will usually be found to be due to the thickness of walls of the fibers 
and the close crowding together of the wood elements. This is the 
case in agoho and in boxwood. 
