REPORTS FROM THE SECTIONS. 269 
way in which these cheap lenses are made, and contrasted it with 
an account of the elaborate and careful manner in which such 
makers as Zeiss hei Seiberz re their work. 
Mr. rt read a paper on “ Professor Abbe’s Theo 
of Micros scopic ten, Pe illustrate: ie paser sna with his aif. 
fraction platte. Mr. Hirst’s paper showed the possibility of 
misinterpretation when close-lined objects are viewed under 
igh powers, and some novel facts bearing closely on the study of 
the m markings on diatoms were Mise by experiments with the 
diffraction platte. 
MONDAY, 12 NOVEMBER, 1877. 
Mr. Atrryp Rozerts, M.R.C.S., in the Chair. 
RETARY a i that he had no papers from the 
The Src 
members to be read that evening. 
e Rev. GrorcE Maier read a letter that he had receiy ed 
stage was constructed so as to remain horizontal while the tubes 
of the microscope incline at a convenient angle for observation. 
The whole instrument was substantially made, and the finish 
reflected oe credit on the maker. 
IvERSIDGE exhibited specimens of “diseased” 
ro 
co] 
° 
w 
Berkeley and Mr. Broom, the two ablest English funglogists, 
and they had pronounced the markings on the leaves to sag due 
to the presence of a minute fungus, a species of Depaze 
the little lied we bodies under the leaf scrolls which Professor 
once a fortnight al roar the recess. 
8 
