-2,-. 1 



ANIMAL Mi:< IIAMSM. 



.oM-tant. may he considered ;ts hori/oiitally extended, tending 

 neither forwards nor liackwards. This line represents, there- 

 Inn', to some extent, the zern of the scale of the movements 

 of tin- \\ing in its antero-posterior direction. The inspection 

 ot the curve si io\vs us also, that the pigeon's wing was carried 

 more especially in the direction of the upper parts, similar to 

 the point A; in other terms, that the forward predominated 

 over the Backward movement. 



!'!(. lut; SujMT]isiliiin of tliu preceding curves on p.iper dri'ie<l in inilli. 

 iin tic--. The two curves hiive a common direction with reference t the 



Tlie same explanations would apply to the lower curve 

 II P, which expresses the movements of the wing upwards 

 and downwards 



In order to ascertain if the course of the pigeon's wing iu 

 the present experiment is apparently the same as that of tlie 

 lni//.ird recorded heiore, we have constructed the complete 

 curve of the \\ing during one of its revolutions, making use 

 for thi-~ 1'iirpoM' of the two partial curves of tig. 105. 



The following is the method employed in this ((instruction : 



In order to i;ive more facility to the measurement of the 

 positions nf the different points of these curves, we have 

 ccpied them l.oth on a paper graduated in centimetres ;. I 



