346 ANIMAL MECHANICS. 



On measuring the lines, I found 



SK = p = 1,65 in. 

 SK' = jt/= 0 80 „ 

 SI= p = 1 86 „ I 



From which we find 



p = 1.65 in. 



// 



sin 20 = — r — - 

 Vp'-p* 



2$ = 68° 28'. 



These values differ from the constants of the hyperboloid— 



2C, by 0.03 of an inch ; 

 2^, by o° 28'. 



(3.) Adductor secundus (j3) — Woman. — The next example 

 of skew muscles that I shall give is the case of a woman, 

 on whom the following measurements were made : — 



Woman — Adductor secundus (j3). 



Lengths of Origin and 

 Lengths of Fibres. Insertion. 



p = 5.67 in. a = 2.55 in. 



Pi = 8.00 „ a' = 7.27 „ 



P% = 11.57 » 



Constants of Hyperboloid. 

 2C = 3.60 

 2(p = 70 0 . 



The positions of the points I and 1' w T ere determined, as 

 in the case of the Llama, by taking the fibres in pairs, and 



