CI.XXXII ROYAL SOCIETY OF CANADA 



wave lengths of liglit in interstellar space by electrons ; the motion and 

 size of binary stars; the detecting of variable stars; photography as an 

 aid for the astronomer; the registering micrometer; the improvements 

 in the astronomical clock; sun spots; the canals of Mars; the rotation 

 of Venus; Jupiter's belts and great red spot; Saturn's rings; comets; 

 geodesy; deterniiualion of gravity; terrestrial magnetism and .-eismo- 

 logy. 



10. " Astronomy as Applied to Surveying," by C. C. Smith, B.A. 



Mr. Smith showed that all surveys have to do with finding the co- 

 ordinates of points on the earth's surface. He discussed the subject 

 under two headings — small surveys in which the same reference line for 

 azimuth may be used throughout; larger surveys where more than one 

 reference line must be used. The problem of finding the form of the 

 earth from surveys of the latter class was discussed. The importance of 

 astronomical data in all surveys was shown. 



11. " The Electron Theory of Matter," by Professor H. T. Barnes 

 of McGill. 



This lecture gave in a short form a statement of the electron theory 

 and the experiments and arguments which led to its adoption. Son^e of 

 the experiments referred to were performed during the lecture, and tiie 

 more striking conclusions reached were presented in popular form. 



12. " Convection as a Factor in Stellar Variation," by R. E. De 

 Lury. 



Dr. De Lury gave a somewhat speculative paper which discussed 

 the periodic light variations of stars, attributing them to periodic dis- 

 turbances in the atmospheres of the stars caused by the orbital motion 

 of satellites ai'd ascribing the different classes of variation to atmospheres 

 of different character. 



13. " Maps and Map-Making in Canada," by J. White, F.E.G.S. 

 Mr. White gave an account of map-making from the earliest times 



with special reference to the early maps of America and Canada. He 

 then described the processes of compiling, engraving and printing maps 

 as it is now carried out. An interesting collection of maps was exhibited 

 in connection with this lecture. 



14. " Gravity at Sea," by Dr. Otto Klotz. 



Dr. Klotz made clear the principles upon which the method of 

 obtaining the value of gravity at sea is based — the '"'boiling thermo- 

 meter" and the barometer — and discussed the results obtained by Dr. 

 Hecker over the Atlantic, Indian and Pacific oceans. Diagrams of 

 the apparatus were thrown on the screen. 



14. " The New Single-Prism Spectrograph," by J. S. Plaskett, B.A. 



Mr. Plaskett discussed the design of the new single-prism spectro- 



