King and Eowney— Eozoon Canadense.'' 145 
the " true cell wall." Five of the processes stand out conspicuously : 
three of the smaller ones are also conspicuous ; but the remainder are 
obscurely defined. Tt is remarkable, that one of the largest is slightly 
bulbose at the extremity" ! As this example shows no appearance of 
*' sharp angular needles radiating from a centre, or irregularily dis- 
posed," it must be taken to represent the "true cell wall." If our 
position is denied, Dr. Dawson will have to support himself by some- 
thing more than mere gratuitous statements, or by weightier arguments 
than such as he is in the habit of adducing. 
This ends our criticisms on every point which Dr. Dawson regards 
''as essential by way of explanation and defence of the organic nature 
of Eozoon." We would beg leave, however, to observe, that there are 
other and more essential points that have been overlooked. Possibly 
they may have been considered no better than the " multitude" which 
he felt '' it would be impossible to enter into," and which we cannot 
help thinking may be related to those treated of in the concluding 
section of the present Paper. 
Dr. Sterry Hunt, instead of treating of the mineralogical and che- 
mical aspects of the question, as his special studies led us to expect, 
confines himself to ''making a few criticisms" on the "views" we 
suggested to account for the mineral changes in serpentine, which, in 
our opinion, have developed the various " eozoonal features ;" and hence 
his paper is remarkable for the absence of even the slightest allusion to 
the evidences and arguments we adduced to show, from their circum- 
stances of occurrence, modifications, mineral and chemical characters, 
that these features are demonstratively of inorganic origin. Such 
absence is a fact, the significance of which we duly appreciate; and 
the full recognition of which we trust will not be hereafter ignored by 
those who believe in "Eozoon." Our theory, in many respects may 
be right, or it may be wrong : and although nothing more than a sub- 
ordinate matter in the main question before us, we feel much pleasure in 
acknowledging that it has been correctly represented by Dr. Hunt in its 
principal points ; and in having the opportunity of discussing it with 
him on the present occasion. 
Dr. S. Hunt's ideas of pseudomorphism, it is well known, are at 
variance with those commonly entertained ; while, to us, they appear 
to be in no respect in advance of the latter : indeed, in limiting the 
phenomenon to crystalline solids, they place him in some points in a 
retrograde position. Still, presuming he will not deny that serpentine 
occurs in the form of crystals belonging to amphibole, augite, olivine, 
&c., and that in such cases the serpentine must be a pseudomorph, — we 
would ask him, notwithstanding the chance of our being rebuked as 
extravagant pseudomorphists, if these instances ought not to be taken 
as evidences that rock masses (diorites, dolerites, olivenites), essentially 
composed of the minerals named, can be similarly changed? We need not 
dwell on cases of the kind : — one, the dolerite of Monzoni, was noticed 
R. I. A. PROC. — VOL. I., SER. II., SCIENCE. U 
