App. VII.
APPENDIX.
magnitude, consequently they do not encounter one another, and therefore the medium has no continuity.
It is probable that the difference in the behaviour of air or any other gas, and the medium, will be least at very high and very low velocities; at intermediate velocities the present mode of treatment is unlikely to be of any utility. It seems possible that the j)resent theory may find some application in relation to the flight of high velocity projectiles.
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