J, IX) 1 8 



NATURE 



93 



n a strikingl) coloured original, 



which is included, thai demonstrates the great 

 power that one has in the us,- of their panchro- 

 matic plates. \ similar portfolio will be senl 

 |i.)si free to anyone interested in tin- subject who 

 applies i"i it. Tin- first print is from a negative 



on an ordinary plate, and shows yellow and yel- 

 lowish green much loo dark, red hlack, and dark 



blue verj lig panchromatic plate, without 



a light filter, gives the rvt\ and yellow, especially 

 the red, too light instead ol too dark, and the 

 blues are a little imprc interposition ol 



a light filter that increases the exposure by only- 

 three times darkens the blues, strikingly, though 

 not quite enough. Presumably this is a yellow 



filter, as it leaves the red and \. How and yellow ish- 



. too light. A green filtei would have cor- 



. .]-, as well as tin Hues, as explained 

 above, and a photograph taken through one would 



been ■•■ most instructive addition to the port- 



l II IPMAN |( '\l s. 



NOTES. 



Owrxfi to the greatly increased rust of production 



le the conditions of war, ii has been found 



ssan to increase the price of weekly is-m - ol 



Naturi from 6d. I" gd. The change in price will tak( 



with the issue of Octobei 24. For particulars 



ol tin new subscription rates see p. xxxiv. 



tm following is a 1 i si ,if the foreign delegates ap- 

 pointed to attend tin- Inter-Allied 1 onference on tin 

 Future of International Scientifii Organisations, which 

 i- to In In lil ai Burlington House, Piccadilly, nexl 

 week: Belgium: M Lecointe, Prof. Massart, and M. 

 ili la \ "alli'-e Poussin. France: MM. B. Baillaud, 

 1, Bigourdan, V. Haller, Lacroix (permanent secre- 

 mii des Sciences), C. Lallemand, Moureu, 

 and E. Picard (permanent secret , icademie d.-- 

 1 (ai |i .- Pi of. V. Volti rra 1 Member of the 

 Italian Senate). Japan: Prof. Joji Sakurai anil M. \. 

 Janakadate. Portugal: Prof. B. I reire. Serbia: Prof. 

 B. Popovitch and Dr. Zoujovitch. U.S.A.: Dr. E. 

 Bumstead, Col. f. J. Carty, Dr. W. J. Durand, Dr. S. 

 Flexner, Prof. '.. I-".. Hale, and Dr. A. A. Noyes. 

 The British delegates are to bi nominated during the 

 n i-ek. 



This ' ing of the Arrei can Association is 



to tal Baltimoi e, Ma . under the auspici - 



fohns Hopkins University, from December 27 

 to ji. Boston had previously been selected as the 

 nam men of sciem 1 an 

 at present working in Washington with matters con- 

 ed with the war, Baltimon has been chosen in 

 take it- place. The activities of the meeting will be 

 mainlv directed to the applicatioi ■ of science to the 

 uggle. 



A War Committee of Technical Societies has been 

 formed in tin United x iea, with repre- 



tives hum tin- following so - tnd institutes: 



American Society ol Civil Engineers, American In- 

 stitute ol Electrical Engineers, American Society of 

 Mechanical I ngineers, American Institute of Mining 

 Gas [nstituti . Vmei ii an Electro- 

 chem I lliiuiinai in ing Society, 



Mining ami Metallurgical Societ; Vmerica, Ameri- 



Sa ietj ol Refrigerating Engineers, and Am 

 Institute of 1 hemical Engineers. 

 V '. 2553. VOL. I02 



A MEETING "I 'In Optical Societ} will be held at 

 1I1. Imperial ( College mil .1 bnulog; . 



Kensington, on Thursday, October 10, 

 7 p.m., when tin- following contributions will bi sub- 

 mitted f'T discussion: on 'Si nd Magnitudes 

 ol Centring Errors in a s - Saval Instructor 

 T, Y. Baker ; anil (6) [nten h.mm- 

 ahilitv ..I Stop ami Object,' I. Chaundy. 



\i iln- general meeting of thi I itution of 



Mechanical Engineers, to In- held al 6 \ m on Friday, 



Octobei i8, tin- following papers will be n ; "A 



Law Governing the Resistance to Pei on of 



Metals which an- Capable of Plastic I >• 



anil a New Hardness Scale in Fundamental I 

 Prol C. A. Edwards ami F. W. Willis; "The ' 

 ,,t the Indentation Method in thi Determination of 

 Hardness," l\. G. C. Batson; ami "The Ludwik 

 Hai dness Tesl ," Dr. W. ( '. I nwin. 



The first general meeting of the National L'nion of 

 Scientific Workers (for the determination of its con- 

 stitution and to elect its first representative council) is 

 held in London in the Inst week of the present 

 month. Information as to the time and place of th< 

 meeting can be obtained from the secretary, Dr. 

 Norman lv. Campbell, North Lodge, Queen's Road, 

 Teddington. 



Mr. A. E. Berriman, chief engineer to the Daimler 



Co., has been appointed Deput) Controller of the 



Technical Department of the Department of Aircraft 



Production of the Ministry of Munitions, in succes- 



ihe late Prof. Bertram Hopkinson. 



We regret to have to announce the death of Dr. 

 Henry Dyer, the former first principal of the lm, 

 College of Engineering at Tokyo, Japan. 



Bishop Mitchinson, Master of Pembroke College, 

 Oxford, whosi sudden death at the age of eighty-five 

 was announced in the Times of September 20, was 

 a warm friend of science and a naturalist of the good 

 old-fashioned kind. In 1855 he passed out of thi 

 schools at Oxford with two first classes, om in 

 Lil. Hum., the other in natural science. When he 

 went to Barbados as its bishop he was already well 

 grounded in botany, and his knowledge of the British 

 flora was extensive and precise. In Barbados he 

 found a new plant-world to conquer, and sent many- 

 trophies home to enrich our national collection. But 

 ii was geology that proved his favourite hobby, and 

 the collection of fossils which he amassed and lately 

 presented to University College, London, contains 

 -.mi, ,,m interesting forms. \ friend recalls with 

 admiration and delight his courage on one occasion 

 as a collector when, wilh tin- assistance of some 

 quarrymen, but without official sanction, he blasted 

 down man} tons of dill al Porth-y-rhaw in search of 

 Paradoxides, hoping thai ibis giant Trilobite might 

 retain sorm h of In limbs. Fine specimens re- 

 warded his enterprise, but never a sign of a limb. 



hich -11 M;. iently proves that this big creature did no1 

 progress by walking. Bishop Mitchinson was a 

 fellow of lie- Geological Society, and served on its 

 council. M.-mv of the older members stili retain a 

 happv memory "I their friendly reunions in th 

 Master's lodge, cheered bj the genial hospitality of 

 th ial of hosts - . 



Thi death is announced of Mr. A. S. Esslen 

 lat, i ontrolli 1 of the Optii al Munition-. ' 



1 Potash Produi tion I >epartment of the Mir 

 uf Mm 



li .uh is announci d, in his sixt -si vi nth year, 

 of Dr. Bvtob D. Halsted, who was p - 1 botany 



