14 
which he gave preference to the Amici prism when the substage 
admitted of its application. 
Mr. Wonror then described the different methods for illuminating 
opaque objects and for obtaining dark ground illumination, such as the 
bull’s-eye condenser, the Leiberkuhn, parabolic illuminator, Wenham’s 
paraboloid, &c., and called attention to a plan adopted by Mr. 
D’Alquen for enlarging the image by inserting within the tube a plano- 
concave or Barlow lens. 
The Meeting then became a Conversazione, at which Mr. Henna 
and Dr. Hatxrrax exhibited lined and other objects with the mirror, 
condenser, and different prisms as illuminators, and Mr. Wonror 
exhibited objects with Wenham’s paraboloid and different dark ground. 
illuminators. - 
In connection with the November Meeting, it was remarked that 
one of the objects of having Microscopical Meetings was to encourage 
the Members to work at subjects which might from time to time be 
suggested, and that perhaps as good a subject as any would be ‘‘ Bone 
and Allied Structures,” in the preparation of which Dr. Ormerod’s 
method could be put to a practical test, and Members might prepare 
specimens for exhibition. 
NoveMBER 10TH. 
ORDINARY MEETING.—MR. J. HOWELL, ON “ EX- 
CAVATIONS THROUGH THE POST- PLIOCENE 
~FORMATION OF THE TEMPLE FIELD, BRIGHTON.” 
The Town of Brighton stands on five sections, four of which 
belong to the Post-Pliocene and one to the Cretaceous formation. 
The Temple Field is situated at the eastern extremity of the 
Hampshire or Eocene Basin, scooped out of the chalk in which the 
Tertiary Beds were deposited. The rim of this Basin is the western 
side of Church Hill, and here, though the Tertiaries have been washed. 
away on this side of Pagham, a Geologist might expect to find their . 
lithological remains, and such is actually the case, as here they lie in 
