14 



The formation of a vortex of a type y 2 a)= const ant might have 

 been, and has been, previously surmised from the circumstance 

 that it is that most easily produced in any liquid such as water. 

 Any sink or suction hole is liable to produce a vortex, of this 

 particular kind, and none other, on the smallest provocation, 

 and the mixing of converging streams not originally forming 

 a vortex in which r 2 oj= constant has a powerful propen- 

 sity to get as near this form as they can, totally regard- 

 less of whether the vortex is in a vertical, horizontal, or 

 inclined plane ; so that in taking such a vortex to be approxi- 

 mately that in a screw propeller, irrespective of the precise detail 

 of form of blades, and other circumstances, no new, unknown, 

 or strange doctrine is put forward, nor is the formation of such 

 vortices even under much more discouraging circumstances in 

 discordance with the facts of experience, but rather the contrary. 



The Table of Horse Power, exhibited when the Paper to 

 which this note is appended, was read, is subjoined. 



