MAPS and BOOKS. — The DistricL to be traversed is on sheet 69 of the one 
inch Orchiance Survey Map. For tlie glacial geology reference may be made to 
papers Ijy Mr. j. E. Wilson and by Messrs. Albert Jowett and 11. H. Muft", read to 
the Britisli Association at their Bradford Meeting, 1900, and printed in the 
"Bradford Scientific Journal" — the publication of the Bradford Scientific 
Association— and to a fuller paper by Messrs. Jowell and Mufif, in the Proceedings 
-of the ^'(^rks]lire (Geological and Polytechnic Sociel\-, vol. \v., ])art ii, 1904. The 
British Association Kandbook to Bradford and the neighl)ourhood gives notes 
-on the l:)otan\-, geology, /.oolog}', cnlomology, and nieleorology of Bradford. 
CHELLOW DEAN and BELL DEAN.— The existence of an extra 
morainic lake, due to llie danniiing u]) of ihe Bradford Beck, was noted by Professor 
H. Carvil Lewis in a ]ia])cr read to the British Association in 1887. The evidence 
has since been very fully worked \)y Mr. |. E. Wilson, and by Messrs. A. Jowett 
and 11. B. Muff, and by a Committee of the Bradford Scientific Association, who 
liad the late Mr. J. Moncknuui, D.Sc, as recorder. These workers have shown 
that the glacier occupying the main valley of the Aire and I he lower part of its 
tributary valleys obstructed the normal courses of the water llov.ing from the 
unglacialed area on the Pennine Hills, and impounded it in llie upper parts of the 
tributary valleys. In this manner a chain of six lal:es was formed fringing the 
south western margin of the ice. The surplus waters discharging from each lake 
passed into the next lake to the south and east, whilst the discharge from the 
lowest — the Bradford lake — escaped across the main watershed into the Spen Valley, 
and so into Calderdale. The district selected for an excursion is the ridge 
separating the lowest of these lakes from the one above it — that occupying the 
Harden and Cottingley valleys. This ridge is gashed through by a series of dry 
-valleys, which aftord, according to Messrs. Jowett and Muff, evidence of no fewer 
than seven stages in the advance, retreat, readvance and final retreat of the ice. 
Chellow Dean is the most important of tliese \ alleys, and it is now occupied by 
two service reservoirs for the Bradford water suppl)'. At the maximum extension 
of the Chellow Dean must have been entirely under the (ilacier, which at Ilarrop 
Edge, a little to the north-west, overtopped the 900ft. contour line. 
Bell Dean, which will also be visited if the weather is suitable, was a link 
in the chain of channels draining the whole series of lakes at the maximum 
extension of the ice. The lake at its up])er end — in Stream Head— must have been 
very small, but since the surplus waters of other Jakes — about Denholme, on 
Oxenhope Moors, and in the Worth Valley between Crow Hill and Ponden — 
drained through it, the volume of water finding its way into the Bradford Valley 
through Bell Dean must have been considerable. From the hill-top about 
Thornton distant views may be obtained of others in the system of overflow 
•channels. 
THE CARTWRIGHT HALL, was opened in the early part of last year, having 
been built at a total cost of about ^70,000, of which ^47,500 was tlie gift of Lord 
Masham. The buikhng stands in the park of, and occupies the actual site of Lord 
Masham's ancestral home, the estate having been sold to the Corporation of 
Bradford in 1870, as a public park. The building arose out of a desire of T>ord 
Masham to do honour to the memory of the Rev. Dr. lulmund Carlwright {b. 1743 — 
d. 1823), the inventor of the power-loom and one of the pioneers in the invention 
of a wool-combing machine. A fine statue of Cartwright, by Mr. 11. C. Fehr, 
decorates the reception Hall. The up[)er floor of the building is used as a picture- 
gallery for the city, and will, on the visit of the Union, be arranged with the 
permanent collection of pictures. The lower-floor is to be devoted to museum 
purposes. One of the rooms is to be occupied by a series — not yet arranged — of 
exhibits illustrating the development of the human arts. A small-room adjoining 
will contain a series of pictures and antit[uities of a local character. 
The other end of the building, in which a special exhibition is arranged for the 
•occasion of the visit of the Yorkshire Naturalists' Union, has been allotted by the 
Museum Committee of the Bradford Corporation, to a natural history museum. 
A scheme has been drawn up by the Council of the Bradford Scientific Association, 
and has received the approval of the Museums Committee, for the constitution of 
the natural history museum. It is intended that the museum shall have the special 
purpose of illustrating the natural history of Yorkshire, and of Morecambe Bay. 
