BULLETIN 537, U. S. DEPARTMENT OF AGRICULTURE. 
•<? 
•*s< 
^t)<0^0 
© r~ <n r- lc 
■sis 
£E ^ 
CN x^,^ 
Per cent 
of wear. 
•-|iOt> 
^ *** ^ ^v — N 
Absorp- 
tion per 
cubic 
foot. 
Pounds. 
0.19 
.17 
1.31 
.82 
Mi 
i li u g d 
i § i ~ I*— 
eee££ 
is 
© 
~C3 
o 
s 
C3 
a 
| 
c 
| 
c 
1 
s- 
< 
c 
— 
c 
— 
3 
c 
1 
= 
cr 
2 
< 
c 
>> 
O 
c 
> 
z 
c 
; 
>> 
'3 
o 
c 
o 
| 
e 
c 
>c 
- 
u 
a 
c 
» 
a 
c 
E 
< 
3 
1* 
c 
c 
- 
X 
o 
c 
s 
a 
t^CSXCNX. 
cm c; *r o 
CC X 
co r^ r- r- co r^ co 
d ri x x s x ci 
ac coco coco 
^^GC Ci * * ^ 
o 
cm cs ro — r-. 
e n ao x d 
rt-XNN 
CM CO 'T CO 
■«*> — O t . — I CN l- ^ C CI 
x cq r: c cj cc ^ c-5 r-; x x 
CC CO i— I CO CO 
CNl- 
N — 
INI !~C 
^CSCSICSICC— ; — ' CN — !N CN) 
CXI X I t- CM CNI w 
- — — — — 
-— c o— o 
6 5 • 
£S : :; 
.££.-_ 
=q O pq O 
5c :>► 
s9§1 
-Z - - - 
2^ 
S = .= 2 a. 
S ccjioo 
r; c c 
££; 
2 2 5 2 0^ 
~ CM CM ~ 
j §3©S3 
