434 SECTIONAL TRANSACTIONS.—J. 
Laboratory experiments were carried out te determine the relative efficiency 
of different methods of lighting, by measuring the number and duration of the 
after-sensations caused. These experiments showed that a diffused light was 
less painful than the ordinary type, and that although a 28 per cent. loss in 
intensity was caused by using an opaque cylinder, yet its efficiency, as measured 
by visual acuity, was equal to that of the ordinary lamp. These new lamps met 
with the miners’ approval and are being generally adopted in the pit. 
Monday, September 17. 
13. Joint Discussion with Section L on The Delinquent Child. 
(See p. 497.) 
14, Dr. J. Drever.—Colour Preference: Some Experimental Results. 
15, Dr. R. H. Tooutess.—Theories of the Soul. 
SHort LEecTurgs. 
16. Mr. R. C. Moozge.-—Educational Tests. 
17, Mr. T. P. Tomiinson.—A Mental Scale for School Surveys. 
18. Dr. Lu. Wynn Jones.—Galvanometric Tests of Emotion. 
Tuesday, September 18. 
19. Mr. J. A. Fraser.—Methods of Selection and Training of Opera- 
tives for the Weaving Industry. : 
(1) The relative importance of training and selection in the weaving industry. © 
(2) Existing methods of selection of operatives. 
(a) Consideration of methods used in different factories. © 
(6) Some defects of these methods. : 
(c) Suggested lines of improvement. 
(3) Existing methods of training operatives. 
(a) Consideration of methods used in different factories. 
(6) Some defects of these methods. 
(c) Suggested lines of improvement. 
(4) Conclusions and problems for further research. 
20. Dr. S. Dawson.—Variations in the Mental Efficiency of Children 
during School Hours. 
The mental efficiency of 1,200 children was tested by giving them ten-minute 
spells of arithmetical work at different hours during the school day, and it 
was found that children over nine years of age worked equally well at 9.30, 
10.30, 11.30 a.m., 1.30 and 2.30 p.m.; that children below that age showed signs 
of a falling-off in efficiency at the last of these periods; that the effect of a 
small amount of practice was comparatively large; and, finally, that the best 
work was done in the hour at which the children had heen accustomed to have 
their arithmetic lesson. 
21. Mr. J. C. Futeeu.—Fatigue Curves with School Children. 
22, Prof. K. P. Carucart.—A new Type of Pursuitmeter. 
23. Miss W. SrreuMan.—Vocational Tests for Dressmakers’ Appren- 
tices. 
Tests for dressmakers’ apprentices are desirable both for vocational guidance 
and for vocational selection. An analysis was therefore made of the factors 
