1912] BRUSH—MECHANICAL TISSUE 461 
tendril from any strain. In the other set, the distal ligature was 
placed the same as the cor- 
responding one in the first set, 
and a second ligature placed 
just below this. To the distal 
one tension was applied, and 
from the proximal one a cord 
ran to the stem, relieving the 
basal two-thirds of tension. By 
this device we have one tendril 
the factor of contact the same 
in both, except that the proxi- 
mal ligature is in a more sensi- 
tive part of the tendril in the 
second preparation than in the 
first, which would tend toward 
a greater development of [tts fvtemontadl Bein 
mechanical tissue in the second io. wedcinta. 
preparation. 
Breaking strengths of the middle third of these tendrils are 
given in table I 
TABLE III 
PERIOD 28 DAYS; FINAL WEIGHT 20 GRAMS 
Under tension Tension-free Under tension Tension-free 
A,s—1I00 grams A;— 875 grams F,—1275 grams F;— 950 grams 
As— 950 A;— 675 F;—1090* Fs— 900 
1000 A,— 7oof F,—12 Fs— 825 
B;—1475 B.— 875 Gi— 1625 7y—1020 
[B,— go00]* s— goo G;—1775 4—I000 
B,—109 Bs— 650 G;—1175 Gs—1000 
Bs— goo By— 890 [G,—1300]¢ 
2—1075 C;— 650 Gg—15 
C,—1075 Co— 875 Gy—1425 Gw—1315T 
TOTS mee eS, Gr—1650 
71200 D;— 625 H,—1075 fi 735 
Ds—1875 Ds— 850 H;—1370 H,— 865 
Ds—1085 D,— 710 H;—1300 He—1685T 
F,— F,—1100 
ae : Average 1239 Average 862 
* Broke at ligature. + Had to be broken close to base. ¢ Tension—coiled about a support. 
