Apri I4, 1923] 
NATURE 
5°99 

Twenty-four papers will be presented during the | 
‘meeting, and their subjects will be announced in 
he Diary of Societies in NATURE. 
TueE May lecture of the Institute of Metals for the 
present year will be delivered by Dr. W. Rosenhain 
at 8 o'clock on Wednesday, May 2, at the Institution 
of Mechanical Engineers. The subject will be ‘‘ The 
aner Structure of Alloys.” 






































Tse Hansen prize for distinguished microbiological 
ork has been awarded this year by the committee 
f Danish trustees to Dr. E. J. Allen, director of the 
ine Biological Association’s laboratory at Ply- 
mouth, for his experimental researches in marine 
m obiology. It will be remembered that this award, 
to which we referred in our issue of February 3, 
Dp. 156, consists of a gold medal and a sum of 2000 
roner. Dr. Allen has been invited to visit Copen- 
hagen to receive the medal and to deliver a lecture on 
is work on May 1. 
A WELL-PRESERVED rib of the gigantic dinosaur, 
Cetiosaurus leedsi, obtained by the late Mr. Alfred N. 
Leeds from the Oxford Clay near Peterborough, has 
ust been added to the other remains of the skeleton 
xhibited in the geological department of the British 
Museum (Natural History). The rib measures six 
eet in length, and is remarkable for its slenderness. 
_ Tue three lectures of the series on physics in in- 
justry arranged by the Institute of Physics last year 
ill be published shortly in the series ‘“ Oxford 
fechnical Publications.’’ The fourth lecture of the 
eries, entitled ‘' The Application of Physics to the 
Seramic Industry,” will be delivered by Dr. J. W. 
Mellor on Wednesday, May 9, at 5.30 P.M., at the 
Institution of Electrical Engineers. Other lectures 
vill be delivered later by Prof. C. H. Desch on “‘ The 
Physicist in Metallurgy,’”’ and by Dr. A. E. Oxley on 
“ The Physicist in the Textile Industries.” 
q “ad no Bill providing for a period of Summer Time 
as passed by the French Chamber of Deputies before 
ad Bireming for the holidays, the French Government 
has decided not to define such a period this year, but 
nerely to take particular measures in regard to 
holiday and health resorts. 
_ THE seventy-sixth annual meeting of the Palzonto- 
graphical Society was held on March 31 in the Geo- 
logical Society’s rooms, Burlington House, Mr. E. T. 
ewton, president, in the chair. The annual report 
of the council referred to the reduction in the size of 
the society’s annual volume owing to increased costs 
and smaller membership, but announced the early 
beginning of new monographs of Malacostracous 
‘Crustacea, by Mr. Henry Woods, and of Gault 
Ammonites, by Dr. L. F. Spath. Contributions had 
been received towards the cost of plates from the 
niversity of Bristol and from Mr. F. W. Harmer. 
Messrs. A. J. Bull, E. Heron-Allen, H. B. Milner, and 
. Wrigley were elected new members of council. 
. E. T. Newton was re-elected president, and Mr. 
Robert S. Herries and Dr. A. Smith Woodward were 
elected treasurer and secretary respectively. 
NO, 2789, VOL. 111] 
A NOTE on cleaner air for London appears in the 
Meteorological Magazine for March. The Public 
Control Committee of the London County Council is 
considering how far fog in London is the result of 
atmospheric pollution due to preventable causes, and 
how far the atmosphere may be improved by the 
larger use of electricity for power and other purposes. 
It is also being considered whether further powers 
are required to deal with the emission of smoke. 
Detailed reports have been prepared, and these appear 
to be under discussion by the Council. 
A NEw type of pocket magnifier is now included in 
the optical products of Messrs. Cooke, Troughton and 
Simms, Ltd., Buckingham Works, York. We have 
had an opportunity of examining one of these. The 
lens consists of an achromatic doublet giving a mag- 
nification of five with a focal length of 2 in., an 
aperture of 0°85 in., and a field of view of about 2 in. 
in diameter. The field is flat and free from distortion 
and colour, and the definition is good over the whole 
of it. The lens is fitted in a duralumin mount which 
can be folded when the magnifier is not in use. 
Magnifiers of this type are now being supplied with 
powers of 2}, 5, and ro respectively. 
BEGINNERS in bee-keeping will find some useful 
information in Leaflet 128, recently revised by the 
Ministry of Agriculture and Fisheries. Bee-keeping 
is an occupation eminently suitable for small-holders, 
cottagers, and others with only a limited space avail- 
able. The insects are, moreover, active pollinators 
of fruit blossoms, and consequently have other uses 
besides the production of honey. Having mastered 
the contents of this leaflet, we advise the beginner to 
procure the collected leaflets on bee-keeping (seven 
in number), which can be obtained from the Ministry, 
at 10 Whitehall Palce, S.W.1, at the low price of 6d., 
post free. 
Tue Gifford Emonds prize, value 1oo/., which is 
awarded every two years for an essay on a subject 
dealing with ophthalmology and involving original 
work, and open to any British subject holding a 
medical qualification, is now open to competition. 
The subject chosen is ‘ Iridocyclitis.” Preference 
will be given to original work based on any branch 
of the subject, rather than to compilations of the 
writings of previous observers. Full particulars of 
the prize can be obtained from the Secretary Super- 
intendent, Royal London Ophthalmic Hospital, 
E.C.1. Essays must be sent in not Jater than 
December 31, 1924. 
Messrs. H. SoTHERAN AND Co. (43 Piccadilly, W.1) 
have recently purchased and are offering for sale as a 
whole the library of books on British ornithology 
formed by Major W. H. Mullens. It contains about 
3000 volumes, and ranges from the ‘‘ Avium prae- 
cipuarum” of William Turner, 1544, to Beebe’s 
recently completed ‘‘ Monograph on the Pheasants.” 
THE catalogues issued by the firm of Bernard 
Quaritch, Ltd., 11 Grafton Street, W.1, are always 
of interest. The latest one (No. 376) contains up- 
