CIV ROYAL SOCIETY OF CANADA 



The officers elected lor tlie eiisuini;- year are : 



President — Prof. Dupuis. 



Vice-president — Mr. Keefer. 



Secretary — Mr. Deville. 



The section consists of twenty-one nienilters, of whom twelve were 

 present at the meeting. 



Herewith is a list of the papers read. 



1 . — '• On the etficiency of ^ inch jets from circular orifices, impinging 

 upon surfaces of different forms." bj" John T. Farmer, Eoyal 

 Commissioners' scholar ; Cmnmunicated by Prof. Bovey. 



2. — " An investigation as to the relative thermal and plant efficiencies 

 of compound, triple and quadruple expansion engines." by Alex. 

 L. Mellanby, Eo3'al Commissioners' scholar; Communicated by 

 Prof Bovey. 



g — '-The periodicity of aerolites,'" by Arthur Harvey. F.L.S. 



4. — " Measurements of the temperature of the river water opposite 

 3Iontreal. made during the winter with a differential platinum 

 thermometer." by IFoward T. Barnes. M.A.Sc. ; Communicated 

 by Prof. Callendar. 



5. — " Mechanism for describing conic sections," by Prof. Guest ; 

 Communicated by Prof. McLeod. 



6. — •' Some experiments with X-rays," by Prof. Callendar, in con- 

 junction with Prof. Cox. 



7. — '■ Continuation of observations on soil temperatures." presented 

 last year bv Prof. Callendar, in conjunction with Prof. C. H. 

 MeLeod. 



8. — "On the calculation of the conductivity of mixtures of electro- 

 lytes," by Prof J. (i. ^Iac(iregor. 



K. Deville, 



Secretary. 



Jleport of Section 1 V. 



Section four has the honour to report a most successful session. The 

 attendance of members was large, being no less than sixteen, while the 

 pajiers presented were interesting and of much scientific value. 



Four meetings were held, at which fifteen papers were presented. 

 The papei"S were in the majority of cases followed hy important discus- 

 sions. 



Owing to the absence, due to serious accident, of the president. 

 Prof. ]\lills, the vice-president. Professor Penhallow, acted as chairman 

 throughout the session. 



The appointment of a representative from the Poyal Society of 

 Canada uj)on the advisor}- Ijoard recommended by Dr. C. W. Stiles, re his 

 vote in the International Zoological Congress, having been referred by 



