ANIMAL MECHANICS. 



85 



Table XIII. — Cross Sections of Tendons in an Adult Human 

 Male Subject. 



Tendon. 



Length used. 



Weight. 



Cross Section. 



i. Biceps humeri (radial 

 tendon), ) 



. , 



2 mc es. 



8 



17 7 grs. 



0.0 3 1 7 scj. in. 



2. Palmaris longus, . 



4 „ 



6-3 „ 



0.005^ ,, 



3. Ext. carp. rad. longr., . 



5 „ 



3i-4 „ 



0.0223 ,, 



4 Ext. carp. rad. brevr., 



3 „ 



18.6 „ 



0.022J ,, 



5. Biceps humeri (scapular ) 

 tendon), J 



3 j| 



17.90 „ 



0.02I2 ,, 



6. Fl. pollicis long., . . . 



2 ,, 



8.2 „ 



O.OI45 ,, 



7. Fl. carp, rad., .... 



3 „ 



I3- 1 » 



O.OI55 » 



8. Ext. carp, uln., . . . 



1 ,, 



5-6 „ 



O.OI99 „ 



9. Fl. digit, subl., . . . 



2 ,, 



37-5 „ 



O.0665 ,, 



10. Fl. digit, prof., . . . 



2 „ 



5^-3 „ 



O.O928 „ 



11. Ext. oss. met. poll., . . 



2 .,, 



16.3 „ 



O.0289 V 



12. Fl. carp, uln., .... 



13. Fl. dig. long, ped., . . 



2 



14-3 „ 



O.O254 >> 







O.O24O 



14. Fl. hallucis long., . . . 







O.O260 ,, 



i 



The cross sections of the tendons of the foot, Nos. 13, 

 14, are estimated from the dried tendons of the subject 

 No. 1, Table XI. (figured in page 77), by a process some- 

 times usefully employed in these investigations. The tendon 

 is dried at 2 1 2 0 F. and weighed, and from that weight the 

 original cross section, when quite fresh, estimated as follows : 



A portion of the tendon of the gastrocnemius muscle of a 

 large Pyrenean mastiff weighed, when quite fresh, 21.25 grs., 

 and when dried, at 21 2° F. weighed 9.1 grs. From this ex- 

 periment we may infer the quantity of solid matter and water 

 in fresh tendon — 



Solid matter, 42.8 per cent. 



Water, 57.2 



100.0 



I found also, by careful measurement of the cross sections 

 of perfectly fresh tendons, that a tendon originally one inch in 



