in conse- when the two bodies must have been close together. +e, oe _——_—_ quence unusually bright, as he receives more light from In such a case, when the comet is very near Jupiter, THE CORNU HELICOPTER. the sun than at his average distance. On the 21st he the planet’s attraction on it will be… … AL Or Ctock atl * At 844 O'Clock: Feb.d4 ellipse of short period. since the ignition point At 10 O'Clock: Jax..22 At 8 O’Clock: Feb.21 There is good reason to was lowered. | As regards believe that the known the total weight which the short-period comets have propellers had to raise un- originated…
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