Contents 



XI 



History of Canadian Metallic Currency .... 



Professor Adam Shortt. 

 The Saxby Gale ....... 



D. L. Hutchinson, Esq. 

 Rural Depopulation in Southern Ontario .... 



S. A. CuDMORE, Esq. 

 Movement of Population in Typical Municipalities . 

 Present Density of Rural Population 

 Causes of the Decline ..... 



Decline of Agricultural Employment due to Machinery 

 Transfer of Other Employments to the Cities 

 The Chemical Interpretation of Vital Phenomena 



J. B. Leathes, M.A., F.R.S. 

 A Revision of My " Nordamerikanische Hydrachniden" 



F. KoENiKE, Bremen. 

 A Contribution to the Morphology and Biology of Insect Galls 



A. CosENS, M.A. 

 Order Acarina ...... 



Order He mi pt era ..... 



Order Lepidoptera ..... 



Order Diptera ..... 



Order Hymenoptera ..... 



Localization of Tannin-Bearing Tissue in Sawfly Galls 

 Notes on Ovipositing by Sawfly Gall Producers 

 Order Hymenoptera .... 



Notes on the Protective Zone . 

 Cytology of Galls .... 



The Beginning of Gall Development . 



Feeding Habits of the Larvae of Gall Producers 



First Series of Experiments 



Second Series of Experiments 



Third Series of Experiments 



Gall-Producing Stimulus 



Literature Cited .... 



Explanation of Plates 

 On the Distribution of Potassium in Renal Cells 



C. P. Brown, M.A 

 I. Introduction . 

 II. Methods of Investigation 

 III. Results 

 Discussion .... 



Summary .... 



Literature ..... 



Explanation of Plates 



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