1898-99.] 
Meetings of the Society. 
723 
son, Esq. ( With Lantern Illustrations.) Communicated by Professor 
Jamieson, M.Inst.C.E. pp. 361-365. 
6. On the Summation of the Series whose wth terms are u n and 1 Ju m 
where u n denotes {an-\-b){a{n + \) + b} |a(w + 2) + &| .... { a(n + r 
- 1) + 6 } . By Professor Anglin. 
7. The action of Persulphates on Iodine. By Hugh Marshall, D.Sc. 
pp. 388-390. 
THIRD ORDINARY MEETING. 
Monday , 9th January 1899. 
Sir William Turner, Vice-President, in the Chair. 
The following Communications were read : — 
1. Determination of the Sign of a Single Term of a Determinant. By 
Thomas Mum, LL.D. pp. 441-477. 
2. The Energy of the Rontgen Rays. By the Rev. Alexander 
Moffat, M.A., B.Sc. Communicated by Dr C. G. Knott, pp. 430- 
438. 
3. On the Development and Morphology of the Marsupial Shoulder- 
Girdle. By Dr Robert Broom. Communicated by Sir William 
Turner. Trans., xxxix. pp. 749-770. {Abstract) pp. 482-3. 
4. On an Interpretation of the IPydrokinetic Equations. By Professor 
Tait. 
5. On the Eliminant of a Set of Quadrics, Ternary or Quaternary. 
By E. J. Nanson. Communicated by Professor Chrystal. pp. 353- 
358. 
Professor Crum Brown moved, in accordance with the notice 
given by him at the General Statutory Meeting : — 
“ That the Ordinary Meetings of the Society be held on the first 
and third Mondays of November, January, February, March, May, 
June, and July, and on the first Monday in December, with the 
exception that when there are five Mondays in January, the 
Meetings shall be held on the second and fourth Mondays of that 
month.” 
Dr Hepburn seconded the motion. Sir John Murray moved, 
and Dr Buchan seconded, “that Professor Crum Brown’s motion 
be referred to the Council, and that the proposal as to changes 
should come before the Society as a recommendation from the 
Council.” 
Dr Thomas Isherwood was balloted for, and declared elected a 
Fellow of the Society. 
