$22 Appendix to Mr. Drach's Paper on Epicyclic CurveSi^O 



Retrogressive Syphonoid. x=^a cos (p, y=zh cos 2(p. .'. (^•\-y)=.'ibx^. 



Prolate Lemnoid and retrogressive Syphonoid. 

 Particular cases (extremes) of the same law of compound circular motion. 



