28o 



THE POPULAR SCIENCE MONTHLY. 



From careful comparisons of diiferent kinds, it has been found that 

 the power of the Washington telescoj^e is about the same as that of 

 LasselPs great four-foot reflector, and the two drawings. Figs, 5 and 

 7, are therefore nearly comparable, i. e., almost as if made with the 



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same telescope at difterent times. It may be said of the last drawing 

 that nothing is there laid down about which the slightest doubt is 

 entertained ; and although, in some respects, it was made in greater 

 haste than is desirable, yet it is sufiiciently accurate to found an argu- 



