120 
NATURE NOTES 
Chiselhurst. Frequent trains. Tickets are available for return by either route. 
Guide, Mr. C. M. Mtihlberg. 
Saturday, June 16. — Stoke d’Abernon. Train leaves Waterloo 2.15, Clapham 
Junction 2.27, Surbiton 2.49 p.m. Meet at Cobham Station at 3.6 p.m. Take 
cheap return tickets to Cobham, is. 9d. Mr. Philip M. Johnston will read a 
paper on Stoke d’Abernon Church. 
Saturday, June 23. — Wimbledon. Members only. Meet in Station Yard 
(L. & S.W. Ry.), near Booking Office, at 3.15 to 3.30 p.m. Trains leave 
Waterloo at 2.57 and Clapham Junction at 3.6 p.m., Ludgate Hill at 2.54, 
Yictoria(L.B. & S.C. Ry.) at 2.53 p.m. Ramble on Common, visiting “Caesar’s 
Camp and Well,” Queensmere and Windmill ; 6.30 to 7.45 the Old Rectory 
Grounds. A paper will be read by Mr. Willson desciiptive of the ancient 
residence. Guide, Mr. S. Willson. 
Saturday , June 30. — Havering-atte-Bower. Train leaves Liverpool Street 
at 2.30 p.m. Take return tickets to Romford, is. 6d. Guide, Mr. A. B. 
Hornblower. 
H.B . — The Vicar has kindly consented to have the old parish registers open 
for inspection. In the village are stocks and a whipping-post. The whole 
district abounds in places of historic interest, ranging from the time of Edward 
the Confessor to that of Charles the First. 
Saturday, July 7. — Weybridge and St. George’s Hills. Meet at Weybridge 
Station at 3.10. Trains leave Waterloo (Main line) at 2.28, and Clapham Junc- 
tion at 2.27 p.m. Passengers front Clapham Junction change at Surbiton. 
Return tickets 2s. iod. Tea at Swiss Cottage at 5 p.m. Further ramble to 
Fox Warren optional. Frequent return trains. Guide, Dr. Henry Willson. 
Projected arrange-ments : — 
July 21. — St. Albans district. Guide, Mr. W. Percival Westell. 
July 28. — Iver Water Splash. Guide, Mr. Wilfred Mark Webb. 
All communications with regard to Excursions should be addressed to Mr. H. 
H. Poole, Hon. Secretary of the Excursions Committee, at 16, Ileathcote Street 
W.C. 
ANSWERS TO CORRESPONDENTS. 
H. Goode. — The function of the “idioblasts” or “internal hairs ” in the 
petioles of water-lilies is not clear. As they contain much calcium-oxalate they 
may be mainly excretory ; but it has been suggested that they are concerned in 
the absorption of gases. 
The “rust” on the fern from Matlock is certainly uncommon. It is Uredo 
polypodii, Pers., and seems mostly, as in this case, to occur on Cystopteris 
fragi/is, though it is also recorded on Polypodium Dryopteris and on Adiantum 
Capillus- Veneris. Your observation that it does not prove fatal is interesting. 
L. Copland. — -You are quite right, your plant is the portulacaceous, 
( Claylonia perfoliata ), which has appeared as a stray in many parts of England 
since 1858. 
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