A, Gautier on recent Researches on Nebulae. 201 
phere particularly advantageous and very rare, I have decided not to de- 
fer longer the presentation of this memoir.” 
ing the details of nebulm of feeble light, as well as to recognize 
4 great nuinber that are double or multiple. He also thinks that 
1t would be well to employ silver for the second reflection. Lord 
be says he has often experienced 
‘ween numerous observations, 
