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PORTFOLIOS. 
Tue following illustrations are reproductions of subjects which 
have appeared during the past year in the Society’s Scientific 
Portfolio, which is circulated to contributing members by Mr. 
H. D. Gower. 
'Puate A.—Calcareous Sandstone from Woolwich Beds, Croydon Cor- 
poration Sewage Farm, Beddington, by Mr. J. H. Baldock. 
Taken September 29th, 1900. This band of hard stone occurs 
about seventeen feet below the surface, and contains many fossils. 
The specimen of which an illustration is shown is full of Unio 
shells and casts of same. (See our Proceedings, 1900-1901, Ixx.) 
PuiaTtE B.—Sand Pipes in Chalk, Chipstead Valley railway cutting, 
beyond Kingswood Station. Taken at 4.50 p.m., July 30th, 1898, 
by Mr. J. H. Baldock. 
Puate C.—Eges of Blackheaded Gull, natural size. Taken October 
10th, 1901. Three exposures, 13 min. at f.64, with the apparatus 
figured. Mr. J. H. Baldock. 
PuateE D.—Apparatus for photographing eggs and other objects ver- 
tically, made by Mr. J. H. Baldock. The eggs are lying in sand, 
or on a little bed of wax on the glass. The same apparatus is also 
extremely useful for copying maps, engravings, and illustrations 
or text from a book. (See Brit. Journal Almanac for 1902.) 
_ Puate E.—Rooks’ nests in elm tree in South End, Croydon. Photo- 
graphed about 1887. This fine old tree stood at the corner of 
Laud Street, in the South End of High Street, South Side, 
opposite the present Grand Theatre, and was taken down about 
1895. The rooks built in this tree for a number of years, and it 
_ was thought a great deal of by the late Mr. Nalder, who preserved 
the tree as much as possible, by staying it with iron rings and 
chains to prevent it falling into the street and becoming a source 
of danger to the public. By Mr. H. D. Gower. 
