PROCEEDINGS OF THE SECTIONS. 395. 
of the summer chrysanthemum infested with the various stages of 
development of a fly, which punctures the leaf and lays its eggs 
within the tissues. This insect is supposed to be the “ black- 
horned leaf-miner,” Phytomyza nigricornis. The name “ miner” 
is given to the grub because it clears away the substance of the 
leaves in galleries. 
Mr. WIzsENER showed some photographic prints taken by Zeiss, 
the well-known optician of Jena, with an anastigmatic photo- 
graphic lens that has been constructed on a new optical formula 
with the Schott glass. The clearness and beauty of these photo- 
graphs elicited high praise. 
Monthly meeting 12th September, 1892. 
Mr. G. D. Hirst in the Chair. 
Mr. F. B. Kynepon exhibited Reichert’s Petrological Microscope.. 
Rey. J. M. Curran exhibited a series of foreign rock sections. 
Monthly meeting 10th October, 1892. 
Dr. H. G. A. WriGcut in the Chair. 
Mr. Wiesner exhibited Zeiss’s microscopes and high power 
objectives sent to the recent Medical Congress, also Abbe’s apto- 
meter and Reichert’s student’s microscope. 
Mr. T. Brinpiey exhibited rock sections by polarised light. 
Monthly meeting 14th November, 1892. 
Dr. H. G. A. Wricut in the Chair. 
A microscopical preparation of the skin of a negro who had died 
in the West Indies from leprosy, showing the bacilli in great abun- 
dance, was exhibited. The slide was stained and mounted by Mr. 
J. McGarviz Smita. 
A first class microscope by Carl Zeiss, optician of Jena, was. 
shown by Mr. WinsEneEr, together with a three-millimetre (4 in.) 
apochromatic homogenous objective by the same maker, having a 
numerical aperture of 1°40. 
