Fic-.l. A anterior margin. Bposterior do. Fi 0.2. shews "how wing increases w speed with its leingtlv 
passing from. A to Bin same lime as it passes from. Cto D. Fi&3. shews Lever action o£ pinion 
the. descent of the wings throwing the body from A to B.. F|&.4 F. forwArd strcKe B. bach - 
ward do shews how oLuroecg ‘st oXionary" fbujhZ the wmg reverses its plane 2^ describes 
figure of 8 curves at A wine) majtes an cungio of 45° which, is decreased at B omd 
changes its. -plane, at C. Fig- 5. by the passage or the wing (obliquely) from- Afa Bthebodf 
ts thrown fro rn Cto 0. owing to the momentum tim insect has oCttaonool at D & also to 
the. vwuj being ynfi t at B by tho return current of air the wing rise s fron t/ BtoE and is 
ready tor another depressvary. FlG.6. Shews currents areoctect by descent of wing. 
^d^ures, -4- ju-uLCi a»’fc'taK**vfta»'i/v, Pettigrew or, dnurcoi/ JCMometioW/. 
