340 



ANIMAL MECHANICS. 



which the work done is negative and for the other positive. 

 The equation to determine the neutral axes is 



cmX . A 2 + KX + cmX' (m 2 - i) = o. (101) 



This equation becomes, in the case of the Llama, 



0.393 A 2 + 0.096 A - 1.58 = o. 



The roots of this equation are 



x ( + i.8 9 

 ( - 2.13. 



If we now solve the equation (97), we find two real 

 roots, viz. : — 



A = - 0.0085, 

 A = + 29.3. 



The remaining roots of the equation are imaginary. 



The small value of A corresponds to the maximum negative 

 work done by the muscle, as may be seen from the following 

 Table, formed by introducing successive values of A into 

 equation (100) : — 



Llama — Adductor secundum (/3). 



X. 









+ 0. IOOO 



-5.6.568 



0. 0000 



- 7.2828 



— 0. 0085 



- 7.2848 



— 0. IOOO 



- 7.2088 



The large value of A corresponds with the maximum 

 positive work of the skew muscle. 



