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POPULAR SCIENCE REVIEW. 
fact, it may be confidently asserted tbat observations under- 
taken with energy and persistency will, if rightly directed, 
more than compensate for defects of instrumental power. It is 
true, however, that in certain quarters we must look to large 
instruments alone for new discoveries. It would be useless 
searching for an ultra-N eptunian planet, or for additional satel- 
lites to Uranus or Neptune, or for the materials to determine 
the rotation periods of these planets, with a small telescope. 
Every observer wiU find objects suited to the capacity of his 
instrument, and he may not only employ it usefully, but pos- 
sibly make a discovery of nearly equal import with that which 
rendered the name of Herschel famous a century ago. 
