IV THE ROYAL SOCIETY OF CANADA 



An Automatic Device for the Make and Break of Electric 



Currents. By O. Maass 137 



SECTION IV. 



President's Address — Fifty Years of Canadian Zoology. By 



J. Playfair McMurrich 1 



Bacteria of Frozen Soils in Quebec. By J. Vanderleck. . 15 



Frozen Muck in the Klondike District, Yukon Territory. 



Canada. By J. B. Tyrrell 39 



Notes on Some Crustacean Forms occurring in the Plankton 

 of Passamaquoddy Bay. By J. Playfair Mc- 

 Murrich 47 



A Slime-Producing Organism from Water. By Wilfrid 



Sadler 63 



The Origination of Ascidia under Quasi-Experimental Con- 

 ditions. By Francis E. Lloyd 71 



The Histogenesis of Vertebrate Striated Muscle, including a 

 Contribution to our Knowledge Regarding the 

 Structure and Functions of the Cell-Nucleus. 

 By John Cameron 81 



The Upper Devonian Plants of Kiltorcan with Descriptions 



of some Neiu Forms. By G. F. Matthew 99 



Concentric Ridges 07i Naturally Occurring Silica. By 



]. Stansfield 117 



The Relationship Between Thyroid and Parathyroid. By 



J. S. Arnason and Swale Vincent 121 



On the Relations of the Adrenal Medulla to the Normal 

 Blood-Pressure in Animals. By K. J. Aust- 

 mann, C. W. Halliday and Swale Vincent. 123 



The Question as to the Relative Importance to Life of Cortex 

 and Medulla of the Adrenal Bodies. By T. D. 

 Wheeler and Swale Vincent 125 



On the Nature of the Blood-pressure Curve produced by 

 stimulation of the Peripheral end of the Splanchnic 

 Nerve. By J. P. Parsons and Swale Vincent 129 



The Colloidal properties of Protoplasm: Imbibition in 



relation to Groivth. Bv Francis E. Lloyd 133 



