Publications, Newspaper Cuttings, Photographs and Correspondence about Persia and the Persian Gulf [‎191v] (383/879)

670
JOURNAL OF THE ROYAL SOCIETY OF ARTS,
May 13, 19ro.
graphic work, the operations of this nature being the
natural culminations of many lines of work and
research. Thus the second chapter, which treats of
“The Diagram of Thermal Equilibrium,” and the
three next following chapters, which treat of special
cases of the diagram, are mainly an introduction to
the understanding and interpretation of photomicro
graphs.
A section calculated to be of service to many of
those whose aims and occupations are outside the
immediate range of “metallography” as defined by
the author, is the chapter on practical pyrometry.
Another section of considerable general interest is
Chapter XVI., which treats of the plastic deforma
tion of metals and alloys, the sub - section on
“ fatigue ” being especially valuable, as fatigue and
the development of slip-bands are so frequently the
first steps towards break-down.
Nearly thirty photomicrographs of metal structure
add value to Dr. Desch’s book.
GENERAL NOTES.
The Hop Yield.—In the discussion in the House
of Commons last year upon a proposal to tax foreign
hops imported into this country, the Chancellor of the
Exchequer said that if in recent years prices had been
bad, the hop grower bad found compensation in the
increased yield per acre. And in the Repost from the
Select Committee on the Hop Industry, drawn up in
1908, this alleged increase in yield is dwelt upon.
Probably there has been an increase, due partly to
the fact that the land from which the hops have been
“ grubbed,” has been, generally speaking, the less
productive land, and again, and much more, to new
and intensive methods of cultivation by means of
trellis, strings, manuring, &c. Precautions, too, are
now more general against blight, mould, &c., by
means of washing and spraying the vines. But an
examination of the figures, just issued by the Board
of Agriculture, does not confirm the Chancellor of the
Exchequer’s theory that shrinkage in the acreage
under hops has been, for the most part, neutralised by
increased yields. Averages are exceptionally mis
leading in the case of the hop crop, for no agricul
tural crop fluctuates so widely in yield, from year to
year. In 1878, when the largest number of acres
was under hops, viz., 71,789, the home produce was
estimated to have exceeded 700,000 cwts. ; in 1905,
when the acreage had been reduced to 48,962, the
home produce fell little short of 700,000 cwts. In
that year, the yield was 14*21 cwts. per acre; but in
1906, it fell to 5'26, the lowest yield since 1890.
Last season, the yield was 6-59 cwts. per acre,
whereas in 1904 it was 10*70, and only on five
previous occasions, during the last twenty - five
years, has the yield per acre been smaller than in
weather remains, as it has always been, the chief
1909. The determining factor in the production
of hops.
MEETINGS FOR THE ENSUING WEEK.
Monday, MAY 30...Royal Institution, Albemarle-street, W.,.
3 p.m. Professor A. E. H. Love, “Earth
Tides.” (Lecture IL).
Asiatic, 22, Albemarle street, W., 4 p.m. Mrs.
Herringham, “Fifth and Sixth Century Ajanta
Wall Paintings.”
Tuesday, May 31...Royal Institution, Albemarle-street, W.,
3 p.m. Mr. C. J. Holmes, “Heredity in Tudor
and Stuart Portraits.” (Lecture I.).
Faraday Society, in the Rooms of the Chemical
Society, Burlington-house, Piccadilly, W., 8 p.m.
1. Mr. J. W. Hinchley, “Some Practical Experi
ence of the Sherardising Process.” 2. Dr. Cecil
H. Desch, “ Note on the Composition of Eutectic
Mixtures.” 3. Mr. E. B. R. Prideaux, " Relations
between Critical Temperature, Boiling-Point, and
Expansion Coefficient of Phosphorus Penta
chloride.” 4. Messrs. Frank E. Weston and
H. Russell Ellis, “ Thermic Reactions in
Vacuo.” Parts I., IL, and III. 5. Demon
stration by Messrs. C. V. Biggs and W.
Pollard Digby, of:—Apparatus for the Rapid
Determination of the Resistance of Liquids, and
Apparatus for the Determination of Specific
Resistance of Oil.
Photographic, 35, Russell-square, W.C., 8 p.m.
Mr. Chapman Jones, “ Intensification by Mercuric-
Chloride and Ferrous-Oxalate, and on the Pro
posed Substitute for Ferrous-Oxalate.”
Wednesday, June 1...ROYAL SOCIETY OF ARTS,
John-street, Adelphi, W.C., 8 p.m. Mr. Sydney
Perks, “The Restoration and Discoveries at the
Guildhall, London.”
Royal Institution, Albemarle-street, W., 3 p.m.
Dr. W. Rosenhain, “ The Constitution and 1
Internal Structure of Alloys.” (Lecture II.)
Royal Archaeological Institution, 20, Hanover-
square, W., 41 p.m. Mr. P. J. Johnston, “ Ex
cavations at Tortington Priory, Sussex.”
THURSDAY, JUNE 2...Royal Institution, Albemarle-street,.
W., 3 p.m. Major Ronald Ross, " Malaria.”
(Lecture I.)
Linnean, Burlington-house, W., 8 p.m. 1. Dr.
A. B. Rendle and others, “The Flora of Gaza—
land.” 2. Mr. H. W. Monckton, “ Witch-knots
in Conifers.” 3. Mr. J. F. Waby, “ Photographs
of Lodoicea Seychellarum, in British Guiana.”
Friday, JUNE 3...Royal Institution, Albemarle-street, W.,
3 p.m , Dr. D. H. Scott, “ The World of Plants
before the Appearance of Flowers.” (Lecture HI.)..
9 p.m., Sir Rennell Rodd, “ Renaissance Monu
ments in the Roman Churches, andtheir Authors.”’
Society for the Promotion of Roman Studies,
Lecture Theatre, Burlington-gardens, W., 42 p.m.
Inaugural Meeting.
African Society, Trocadero Restaurant, Shaftes-
bury-avenue, 73 p.m. Sir Alfred Sharp, “Recent
Progress in Nyasaland."
Saturday, June 4...Royal Institution, Albemarle-street,
W., 3 p.m. (Tyndall Lectures.) Prof. J. A.
Fleming, “ Electrical Heating and Pyrometry..
(Lecture I.).