INTRODUCTION. xliii 



series between the Laurentian and Potsdam periods, but 

 whether Huronian or otherwise I do not pretend to say ; and it 

 may even prove of later date than this." 



It will hereafter (A.D. 1880) be seen that the serpentine lime- 

 stones of Northern New York are now held by the leading 

 geological authorities in the United States to be of Upper 



Cambrian and Lower Silurian ages. 







On the Serpentinite of the Lizard, its original Rock-condition, 1876. 

 Methylotic Phenomena, and Structural Simulations of 

 Organisms. Drs. W. King and T. H. Rowney. Phil. 

 Mag. ser. 5, vol. i. pp. 280-293. 



The rock in many places has undergone a change into saponite, 

 and occasionally into calcite. The former contains bodies of 

 various kinds, strikingly simulating minute corals, vermiform and 

 foraminiferal organisms ; the latter contains cylindrical forms 

 and clusters of spherical bodies, resembling Dawson^s "Archao- 

 spharince" and branching configurations identical with the 

 " canal system" of Eozoon. What appears to be tremolite 

 contains spherical and other bodies wonderfully mimetic of 

 perforated foraminifers, also rods consisting of saponite, serpen- 

 tine, flocculite, or calcite. The rods, especially those com- 

 posed of the last mineral, throw some light on the origin of the 

 " calcareous " examples of the " canal system, '* inasmuch as 

 their component mineral carbonate is clearly the result of 

 chemical alteration. The serpentine contains examples of chry- 

 sotile passing into the " nummuline " or pectinated condition. 



New Facts relating to Eozoon. Dr. J. W. Dawson. Canadian 1876. 



Naturalist, vol. viii. pp. 281-285. 



if And though I must protest against the idea prevailing in 

 some quarters, that there is any necessary connexion between 

 serpentine and Eozoon, yet, as this mineral exists in connexion 

 with many specimens of this fossil, it is time that geologists 

 were warned against the extravagant ideas of pseudomorphism 

 which have been promulgated in connexion with it " I Re- 



