HAMILTON SCIENTIFIC ASSOCIATION. 127 



The Motions of the Earth 



By Mr, ], J, E^el 



111 dealing with this, the lecturer illustrated the subject with 

 an elaborate mechanical device of his own construction, showing 

 the sun and the orbits of the planets ; and as this lecture was in- 

 tended to reach the most untutored student of astronomy as well 

 as to help those further advanced, the ma.\\y confusing technical 

 terms were explained, after which the following eleven motions of 

 the earth were described and discussed : 



1. Diurnal. 



2. Orbital. 



3. Precession of equinoxes. 



4. Parallactic inequality. 



5. Nutation. 



6. Obliquity of the Ecliptic. 



7. Variation of eccentricity. 



8. Changes of major axis. 



9. Perturbations. ; 



10. Planet attraction. 



11. The whole Solar system moving. 



The Sun 



By Rev, Dr, Marsh, 



This paper was intended to instruct and encourage the amateur 

 astronomer, and was profusely illustrated by lantern slides. Many 

 of the photographs were taken with his own 5-inch Brashear 

 telescope. - 



