I -V 9, tgig 



NATURE 



0/0 



hie, jun., 

 he use of : 

 il f.ii ri sinous Is of pre- 



n i : - "I 



111 ectlj 

 hol without the int( rvention of oil ol cl< 

 balsam so dissolved appears to have a Ii 

 tive index than in cases in which xylol o 



solvent. In this connection it maj be mentioned 

 thai turpentine substitute" 



answers well for thinnii .. hat is in a slightly 



I in Saxon Stati Railways a i now submitting their 

 engini ponsible train 



in their psychometric laboratory at Dresden. 

 i .-. :nng des Vi u deu 

 nbahnverwaltungen (Octobi I, thi tests com- 

 i will and - and 



win i I -train. Thi igraph 



- d For the purpos being 



fatigue in.' table; ovei 



the middle finger is run a catgul loop, which passes 

 over a pulley, the other end oi the gut supporting a 

 weight of from 4 to 8 kg., according to the suitability 

 nf the subject. When the middle finger is bent the 

 , ind whin n in the weighl 



is dropped, the process of this mo 

 on a recording drum. With even stroke the drum 

 advances i mm., and every tv ckwork 



movement records a time mark, so that fatigue in 

 terms of lime can be read from the final curve. In 

 addition to giving the mean effici :ncy i 



.end, the ergogram also shows thi 

 fatigue (i.e. diminished efficiency) p as well 



lifts which the subject has to make 

 in order to do i metre-kilogram of work. The system 

 has been sa results as regards 



the selection of men for the proper posts. 



Among announcements of forthcoming books of 



science we notice the following: — "A Source Book 



liological Nature Study," E. R. Dow ling, and 



Geographic and Economic Fou idations of the 



War," J. P. Goode (Cambridge University 



Press); "Studies in v . Dr. H. Head, 



2 Mils., illustrated; "Menders of the Maimed," Prof. 



A. Keith, illustrated; "A Physical Interpretation of 



iration," Lt.-( !oi. J. W. 



; " Manual of War Surgery at the Base," 



Lt.-Col. S. Barling and Capt. J. T. Morrison, illus- 



l; "Trench Fever," Major W . Byam; "The 



Dr. A. McNair Wilson, illustrated; 



and pects of Typhoid and Paratyphoid 



Fevers," Col. A. E. Webb-Johnson, illustrated (/,'. 



. and 1 ladder and Stoughton) ; "Catalysis in 



Industrial Chemistry," Prof. G. G. Henderson; "Thi 



Human Machine and Industrial Efficiency," Prof. 



F. S I ■ ; "Experimental Education," Dr. R. R. 



Rusk; "Education and Social Movements, 1700- 



A. E. Dobbs; and a new edition, in threi 



volumes, of "A System of Physical Chemistry," Prof. 



W. C. McC. Lewis (Longmans and Co.); "The 



Problem of Nervous Breakdown," I >r. E. I.. Ash 



(Mills and Boon, Ltd.); "Rudiment- of Handicraft," 



W. \ ijohn Murray); "Mental Disorders 



ol War," Prof. J. Lepine, edited by Dr. C. Mercier; 



War," Prof. A. Zimmern and 



P. IV, ,1. edited by Dr. E. P. Cumberbatch; "Dis- 



abilities of the Locomotor Apparatus : The Result of 



War Wounds," Prof. A. Broca, edited by Major-Gen. 



rid "Wounds nf the Pleura 

 Lungs," Prof. R. Gregoire and Dr. Courcoux, edited 

 bv Lt.-Col. C. II. Fagge (University 0/ London Press. 

 Ltd.). 



NO. 2567, VOL. I02l 



01 R ii l ; OMIC I/. ( OLUMN. 



S Comet i Braae and Fischer- 



lis comet, 



•■ 1 hi find that il is a periodic comet 

 ..; to the Jupiter group. 



T = ioi8 Sept. 27-5834 G.M.T. 



SI 



191S0 



:,' no , 



= 117 56' 28-2" - 



* = 5_ J 35' i6"3"J 



<p = 2b" 10' 46-9'' 

 = 0-551909 



ears. 



Ephemens for Greenwich Midnight. 



Opposition ok Juno. — Juno will be in opposition or. 

 January 20, it> magnitude being 7-8. The following 

 ephemens is from the Circular of the Berlin Rechen- 

 Institut :— 



Twelve New Spectroscopic Binaries. — In a com- 

 munication to the Journal of the Royal Astronomical 

 Society of Canada (vol. xii., p. 400) Dr. J. S. Plaskett 

 gives particulars of the first twelve spectroscopic 

 binaries which have been discovered with the aid of 

 the new 6-ft. reflecting telescope of the Dominion 

 Astrophysical Observatory at Victoria, B.C. The 

 variable velocities of these stars were detected in the 



u'rse of the measurement of some of the 750 spectra 

 secured between the arrival of the mirror at the 



\ atory on April 29 and the third week in October. 



1 he magnitudes of the stars involved range from 5-0 

 to 6-32, and it would thus appear that very rapid pro- 



- in this field of observation ma}' now be expected. 

 The two stars Boss 4S70 and Boss .s-'.io, which are 

 assigned to class A by the Harvard observers, have 

 found to be of early B type. 

 The Minor Planet 602 Hippodamia. — This small 

 has given a good deal of trouble to those who 

 '•ndeavoured to follow its movements. Both the 

 titricity and inclination are large, the declination 

 (position ranging from 4-51 to — 49 , and the 

 litude from 123 to 14-1. The planet was ob- 

 1 ii unsuccessfully in 

 M. H. Duliosq-Lettre gives new orbit elements 

 Journal des Observateurs (vol. ii.. No. m), and 

 ■ search for it. 

 if Eros. — The Journal des Observa- 

 teurs (vol. ii.. No. 11) contains a series of photo- 

 observations of 433 Eros, made in 1917 at 

 the Cape Observatory by Mr. J. Voute. Owing to 

 ii- high south declination (about <o I wa- 



in Europe. It will again be in opposition 

 .1, but, being near aphelion, it will be 

 faint. 



