Séance da 17 Novembre 1920 



79 



beginning lo spread ont ils wings, (stage corresponding 

 to lìg. 10) ; 1 was then able to ol)S('rve llie niovcnients 

 ol' tlic" blood in tlic ncrvnres. 'V\\v light hind wing 

 was i)laee(l un(h'r the obieclivc, wliiU' th(> body was 



Fi(.. [A.—Einpiisa cgcna. Male. Pare of liiiid wiiii^. 

 Surface aspect. :< fjfi. The peritraclieal circulation se(Mi in 

 a living specimen (turin.i> the unfolding of tlie wing. 



kept last against the stage by the lingers of tiie left 

 liaiid. Tlie magnihcation was ôiS. 



I was nble to see that each licrvnre contains a 

 clearly deiined channel, with continuons sides, along 



