15 
PROCEEDINGS OF THE SOCIETY. 
PAGE 
Meeting, March 15, 1922 227 
„ April 19, 1922 229 
„ May 17, 1922 234 
Authors of Papers printed in the Transactions are entitled to 25 copies of their 
communications gratis. Extra copies can be had at moderate charges on application 
to the Secretary. 
TRADE DIRECTORY and INDEX TO ADVERTISERS. 
Page 
1 
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14 
-rosvenor 
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London, 
12 
Atha, J. W. & Co., 8 Southampton Row, London, W.C.l 
Bausch & Lomb Optical Co., Ltd., 37 Hatton Garden, Lc 
Beck, R. & J., Ltd., 68 Cornhill, London, E.C.3 
British Drug Houses, Ltd., Graham Street, London, N.l 
Browning, John, London, W.C.2 
Cambridge & Paul Instrument Co., Ltd., Cambridge, s 
Place, London, S.W.l 
City Sale and Exchange, 52 Cheapside, London, E.C.2 
Clarkson’s, 338 High Holborn, London, W.C.l 
Dale & Hollins, 11 & 29 Sicilian Avenue, London, W.C.l 
Dolland’s, 35 Ludgate Hill, London, E.C.4 
Dulau & Co., Ltd., 34 Margaret Street, London, W.l... 
Flatters & Garnett, Ltd., 309 Oxford Road, Manchester 
Foyle, W. & G., Ltd., 121 Charing Cross Road, London, W.C.2 
Gallenkamp, A. & Co., Ltd., 19-21 Sun Street, Finsbury Squs 
E.C.2 
Gurr, George T., 35 Perrymead Street, Fulham, London, S.W.6 . 
Hawksley & Sons, 83 Wigmore Street, London, W.l... 
Heffer, W., & Sons, Ltd., 4 Petty Cury, Cambridge ... 
Kelvin Bottomley & Baird, Ltd., Kelvingrove Works, Hither 
London, S.E.13 
Kodak, Ltd., Kingsway, London, W.C.2 
Leitz Microscopes ... 
Lewis, H. K., & Co., Ltd., 136 Gower Street, London, W.C.l 
Ogilvy & Co., 18 Bloomsbury Square, London, W.C.l 
Rheinberg’s Eye-piece and Stage Micrometers, etc. ... 
Rudolph & Beesley, 65 Margaret Street, Oxford Circus, London, W.l 
Spencer Lens Co., Buffalo, New York, U.S.A., and 83 Wigmore Street, 
London, W.l ... 
Stevens’s Auction Rooms, Ltd., 38 King Street, London, W.C.2 
Wallace Heaton, Ltd., 119 New Bond Street, London, W.l... 
Watson, W., & Sons, Ltd., 313 High Holborn, London, W.C.2 
Wheldon & Wesley, Ltd., 38 Great Queen Street, London, W.C.2 
Wratten Specialities for Microscopy 
Green, 
Cover 
Cover 
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4 
4 
iii 
8 
10 
ii 
10 
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14 
4 
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FOR SALE 
BOTANICAL MICROSCOPE (Traveller’s), by Beck, of Cornhill, 
London. Complete in Case. £5. H. Coppock, 7 Piccadilly Arcade, 
London, S.W.l. 
