The Argument from Analogy. 



These references and quotations by no means exhaust the literature of 

 the subject. They are taken mostly from very recent writings, and much 

 to the same effect might be quoted from the older geologists, such as Von 

 Cotta, Neumann, Darwin, Delesse, and others, who have insisted on the ir- 

 ruptive character of gneissic rocks or have regarded gneiss as but a differ- 

 entiated variety of irruptive granite. But enough has been adduced to 

 show that the writer's interpretation of the Archean geology of central 

 Canada, in so far as it depends upon the irruptive nature of the Laurentian 

 gneisses, is not without the strong support of many analogies. 



(193) 



