420 ANIMAL MECHANICS. 



Muscular Tijpe of Birds Wings {continued). 





VII. 



VIII. 



IX. 



X. 



XI. 



XII. 





Jabiru 

 (mean of 

 two). 



Stork 

 (mean of 

 two). 



Common 

 Heron. 



Squacco 

 Heron. 



Flamingo. 



White- 

 headed 

 Eagle 

 (mean of 

 two). 



Scapular. 



Per cent. 



Per cent. 



Per cent. 



Yer cent. 



Per cent. 



Per cent. 



1. Trapezius, . . 



2. Rhomb oideits, . 



3. Serratus magnus, 



1. 16 



0. 82 



1. 14 



1.32 

 0.62 

 o.59 



1.64 

 0.97 

 2.70 



1.68 

 1. 01 

 1. 17 



0.81 

 0.81 

 0.81 



i-45 

 0.85 



1-54 



Abductors. 



1. Deltoideus, . . 



2. Pectoralis avium, 

 3« Teres major, . . 

 4. Spinatus, . . . 



5.8i 

 8-93 

 °. 75 

 3.7o 



4-58 

 8.23 

 0. 68 

 4.20 



3.38 

 7-45 



3.28 



3.02 

 7.89 



°«33 

 3.02 



7.50 

 8.42 



4.o5 



8.45 

 6.09 

 1. 19 

 4-75 



Flexors. 















1. Triceps longus, . 



2. Subscapularis, . 



3. Latiesimus dorsi, 



5.6i 

 1.72 

 1. 17 



4.56 

 3. 12 

 o.93 



3- 6 7 

 2.12 

 0.97 



2.51 

 1.68 

 0.50 



5.58 

 1.83 

 1. 12 



4.83 

 1.79 

 0.96 



Extensors. 















1. Biceps humeri, . 



2. Brachiseus, . . 



2.66 

 o.43 



2.31 

 0.79 



2.99 

 0.39 



2. 02 

 0.50 



2.84 

 0. 71 



4-55 

 -0.S5 



Adductors. 















1. Coraco-brachialis, 



2. Pectoralis major, 



3. Pectoralis minor, 



2. 20 

 62.06 

 1.84 



1-39 

 65.18 

 1.50 



1. 16 

 67.54 

 1-45 



0.50 

 72.83 

 i.34 



1.32 

 62.47 

 1. 12 



1. 3i 

 59.82 



i.57 





IOO 



IOO 



IOO 



IOO 



IOO 



IOO 



Total weight, . 



Oz. av. 

 21*45 



Oz. av. 

 12-89 



Oz. av. 

 518 



Oz. av. 

 2-98 



Oz. av. 

 4-93 



Oz. av. 

 8*89 



The first fact that strikes us, on examining the foregoing 

 Tables, is the extraordinary development of the great pectoral 

 muscle, which in many cases absorbs two-thirds of the entire 

 muscular force of the shoulder joint. This muscle is the 

 great depressor of the wing, and I have already shown what 

 extraordinary care is bestowed upon the placing of the socket 



