768 PKOCEEDINGS OF THE SOCIETY. 



Dr. Hebb reminded the Fellows that at their next ordinary Meeting 

 — which would take place on December 1<S — it would be necessary to 

 nominate Officers and Council for the ensuing year, and also to elect an 

 auditor of the Society's accounts for 1907, preparatory to the Annual 

 Meeting of the Society on January 15. 



The following Instruments, Objects, etc., were exhibited : — 



Messrs. R. and J. Beck : — Stained Starch-granules in Autochrome 

 plate ; Starch-granules in Autochrome plate, showing deposit of silver 

 under ^-in. objectives. 



Mr. C. L. Curties :— The " Nature Study " Microscope and " The 

 Meat Examiner's Microscope." 



Mr. J. Inderwick Pigg : — Photomicrographs of the Development of 

 the prothallus and the fern. 



Mr. E. Moffat : — New Filter for Agar, Gelatin, etc., and photomicro- 

 graphs of Trypanosomes, Bacilli, &c., in illustration of his paper on 

 Light Filters for Photomicrography. 



Mr. J. Scott Underwood : — Microscope, in silver, by Fran9ois 

 Watkins. 



The Society : — Two old Microscopes, and Lantern slides in illustra- 

 tion of Mr. Nelson's paper on Fran9ois Watkins' Microscope. 



Mr. J. W. Gordon, in illustration of his paper : — 1. Mercury globule, 

 to show the bright band edging the under face of the globule. 

 Diameter of globule, 4-^^ in. ; objective i in. ; condenser |- in. ; bright 

 field. 2. Mercury globule, to show the Fresnel rings thrown off from 

 the equatorial zone. The globule is placed slightly aside from the 

 optical axis of the instrument, with the result that the Fresnel rings are 

 compressed on one side and expanded on the opposite side. The eccen- 

 tricity amounts to about the diameter of the globule, o^ in. ; objective, 

 ^ in. ; condenser, 1 in. ; field darkened by a top stop. 3. Piece of 

 etched tin-foil, lighted only by the top light reflected down upon it by 

 the refracting surface of the objective. Objective, yV ^'^- oil-immersion. 

 4. Mercury globule, to show image formed by reflection from the 

 cornea of the observer's eye. Diameter of globule, ^q in. ; objective, 

 ^ in. ; condenser, 1 in. 5. Mercury globule, to show a number of 

 images formed by the various lenses of the objective. Objective, i iu. ; 

 condenser, ^ in. ; diameter of globule, -^io in. 6. Mercury globule, 

 arranged as a test object of resolving power. Diameter of speculum 

 globule, yV i^^- ; diameter of object globule, ^^^^g- in. ; measured diameter 

 of black patch, ^^q- in. ; optical tube-length, 7| in. ; equivalent focal 

 length of ocular, 1^ in. ; equivalent focal length of objective, ^^ in. ; 

 diameter of test disk, 2-g^oo i^- 



Mr. E. F. Law^ : — Lantern slides showing application of colour 

 photography in metallurgy. 



New Fellows. — The following were balloted for and duly elected 

 Ordinary Fellows of the Society : — Messrs. Sidney E. Dowdy and John 

 E. Minns. 



