INTRODUCTION. 



POSTSCRIPTS. 



A, " Eozoon " in loganite (ante, p. xvi). 



Portion of a specimen (highly magnified) of tl Eozoon Canadense," with 

 "chamber-casts" (a) in dark green loganite, imbedded in "white pyroxene " 

 or (?) malacolite (b). The last mineral has undergone in places (a, b) a 

 chemical change (pseudomorphic replacement) into " ferriferous dolomite " 

 the substance of the "intermediate skeleton." The fine lines are 

 cleavage-divisions : the thick black lines (a) were originally the same ; but 

 having become widened into gashes by carbacid solvent action, they are now 

 filled with "ferriferous dolomite": the irregular-shaped dark spaces (6), 

 enlargements of the latter, are also filled with the same mineral. 



N.B. The loganite is in irregularly rounded crystalloids. Specimens 

 proving the same pseudomorphosis, viz. calcite or miemite after a similar 

 mineral silicate, occur in Connemara, Scandinavia, New Jersey, Ceylon, 

 Vosges, and other places (ante, p. xvii &c.). 



B. Considering the statements made by Drs. Carpenter, Dawson, and 

 Sterry Hunt as to the " general acceptance " of " Eozoon" it would be a bene- 

 ficial amusement for them to count up, according to the facts given in the 

 preceding pages, how many "scientists " have written in its favour, and how 

 many against it: possibly it will be found that the former are in the 

 minority ! 



