INTRODUCTION. XXX111 



same time expressing ourselves as " not disputing that the section 

 exhibits some structural peculiarity which gives rise to appear- 

 ance of tubulation. v In connexion with this matter, it may be 

 mentioned that we have frequently observed in minerals a divi- 

 sional structure which it is difficult to describe or designate. In 

 our description of a specimen of peridote, represented on Plate I, 

 fig. 3, mention is made of the occurrence therein of thin fibrous 

 or striated undulating laminae, the u striae or fibres of which are 

 at right angles to the surface of the laminae." A similar struc- 

 tural character, seen on one of the two sets of eminent cleavage- 

 planes> marks the felspar represented in fig. 4, PL I. For 

 want of a better name, we stated that the laminae are fibrous or 

 striated; but we were quite aware at the time that the intersecting 

 striae or fibres are often separated, and seemingly tubif orm : 

 thus, where a transverse section of such fibres is exposed they 

 appear like circular dots even more decidedly than as repre- 

 sented in our figures. We draw attention to this peculiarity, 

 as probably offering an explanation of the " empty tubuli." 

 What we strongly suspect will prove to be the same are the 

 cuts or lines forming the "first" or incipient stage in the 

 development of chrysotile (pp. 9, 14, &c.) ; especially as we are 

 unable to detect any difference between them and the striae, 

 that are thread-like, of feldspar. Seemingly confirming our 

 suspicion is the fact that the " striation " of a feldspar in 

 graphic granite has actually been taken for " vertical tubular 

 structure " by Dr. Carpenter, as will hereafter be seen. 

 Eozoon Canadense. Dr. J. W. Dawson. A letter in ' Nature/ 1874. 

 June 11, vol. x. p. 103. 



" Eozoon " examined chiefly from a Foraminiferal Standpoint. 1874 - 

 Drs. W. King and T. H. Rowney. Ann. & Mag. Nat. 

 Hist. ser. 4, vol. xiv. pp. 274-289. 



Final Note on Eozoon Canadense. Dr. W. B. Carpenter. 1874. 



Ann. & Mag. Nat. Hist. ser. 4, vol. xiv. pp. 371, 372, 

 Dr. Carpenter, notwithstanding the many errors he has c<am- 



