CONTENTS OF NUMBER IV. 



Published September 16tb. 



Article. Page 



XIX. — Observations^ the Geology of St. John County, 



New Brunswick; by G. F. Matthew, Esq., 241 



XX. — On Ailanthine. The silk yielded by the Saturnia 

 or Bonibyx Cynthia, with Remarks on the Ailan- 

 thus glandulosa or False Varnish Tree of China ; 



by Robert Paterson, M.D 260 



XXI. — The Air-Breathers of the Coal Period in Nova 



Scotia; by J. W. Dawson, LL.D., F.R.S., &c 268 



XXII. — On the Origin of Eruptive and Primary Rocks ; 



by Thomas Macfarlane 295 



XXIII. — On the Earth's Climate in Paleozoic Times; by 



T. Sterry Hunt, M.A., F.R.S 323 



Miscellaneous 325 



The Canadian Naturalist and Geologist may be ordered 

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Toronto, "W. C. Chewett & Co. ; W. Manson j H. Rowsell. 

 Hamilton, Geo. Barnes & Co. Kingston, John Creighton. 

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The next number of this Magazine will be published in 

 October, 1863. 



