68 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 56 



PLATE 15 



Fig. 38. Incomplete Flight-curve obtained by Marey's method on a blackened 

 cylinder. (Natural size.) 



Figs. 39, 40. Incomplete Flight-curves obtained by Marey's method on a 

 blackened cylinder. The cylinder was turned more slowly than in fig. 38, so 

 that the parts of the curve overlap. The fly was held horizontally with the 

 anterior end opposite to the direction of the movement of the cylinder. (Nat- 

 ural size.) 



Fig. 41. Flight-curve obtained by means of the flight-kymograph. The fly 

 was held horizontally with the anterior end opposite to the direction of the 

 movement of the board. (Magnified 4 diameters.) 



