PROCEEDINGS FOR 1900 XXIX 
6.—% On Soil Temperature,” by Prof. C. H. McLeod, M.E. 
7.—“ On the Depression of the Freezing Point in Aqueous Solutions 
of Electrolytes,” by Prof. J. G. MacGregor, Dalhousie College, Halifax, 
N.S. 
8.—< On the Depression of the Freezing Point by Solutions contain- 
ing Hydrochloric and Sulphuric Acids,” by James Barnes, M.A., Dal- 
housie College, Halifax, N.S. Communicated by Prof. J. G. MacGregor. 
9.—“ On the Relative Bulk of Weak Aqueous Solutions of certain 
Sulphates and their Constituent Water,” by Charles M. Pasea, B.Sc., 
Dalhousie College, Halifax, N.S. Communicated by Prof. J. G. 
MacGregor. 
Dr. W. Lash Miller, demonstrated to the section a lantern experi- 
ment devised by himself and Dr. F. B. Kenrick to show the transport 
of ions in electrolytes. Strips of glass are coated with hardened gelatine 
and coloured substances used, such as indigo, sulphonate of sodium, 
rosaniline chloride, crocein scarlet, brilliant green. 
The source of electromotive force was a 2000-volt transformer, 
kindly loaned for the purpose by Messrs. Ahearn & Soper, and a battery 
of one hundred aluminium cells. Where direct current is available, an 
induction coil with Wehnelt interrupter and spark gap in the secondary 
may advantageously be substituted. Undue heating of the plates is pre- 
vented by immersion in coal oil. 
The President of the Section, Prof. Cox, and Principal Loudon were 
appointed to represent the section on the delegation of the Society who 
interviewed the Government for urging the immediate construction of 
a suitable building as a National Museum. 
It is recommended that a grant of one hundred dollars be made to 
Prof. J. G. MacGregor to assist him in scientific researches, the results 
of which are to be communicated to the Society. 
The officers elected for the ensuing year are : 
President—Principal Loudon. 
Vice-President—Dr. Ruttan. 
Secretary—E. Deville. 
E. DEVILLE, 
Ottawa, 30th May, 1900. Secretary. 
Report of Section IV. 
The section begs leave to submit the following report. 
It has had a very successful session, embracing a series of five meet- 
ings, at which fifteen members and a number of visitors were present. 
All the papers on the programme or synopses of them were read, and the 
