In addition to the authorities quoted in the first part of the paper, memoirs by Clerk-Maxwell and by Lord Rayleigh are referred to, also a passage in the Beiblätter zu den Ann. d. Physik. (1895, p. 289), which cites Hélie, Traíté de Balistique.

The Author then considers the more obvious defects of the rudely approximate solution of the differential equations which is given in Part I., especially the omission of the direct gravitational effect on the speed, and shows how to take account of the effect of the observed gradual diminution of the angular velocity of the projectile. An improved solution of the problem of § 8 of the paper is also given.

The Author stated that lie had occasionally succeeded in obtaining the kink spoken of in Part I., the projectile being a humming-top made of very thin metal. He had also occasionally obtained a cusp, thus exhibiting the paradoxical result of a projectile's path which is at no point concave downwards.