220 Canadian Record of Science. 
though somewhat distorted by subsequent movements. On 
selecting specimens from the white and more purely calca- 
reous layers, | was pleased to find that they abound in 
fragments of laminz of Eozoén, having the canals filled 
either with dolomite or with colourless serpentine. Other 
portions of the limestone show the peculiar granulated 
structure characteristic of the calcareous lamin of Eozoén, 
but without any appearance of canals, which may in this 
case be occupied with calcite, not distinguishable from the 
substance of the lamin. There are also indications in 
these beds of limestones of the presence of Hozooén not infil- 
trated with serpentine, but having its lamine either com- 
pressed together, or with the spaces between them filled 
with calcite. There are other fragments which, from their 
minute structure, I believe to be organic, but which are 
apparently different from Kozo6n. 
(4.) Veins of Chrysotile. 
I have in previous pages noticed the fact that the 
veins of fibrous chrysotile which abound in serpentinous 
limestones of the Laurentian are of secondary aqueous 
origin, as they fill cracks or fissures not merely crossing 
the beds of the limestone, but passing through the masses 
of Kozoén and the serpentinous concretions which occur in 
the beds. They must, therefore, have been formed by 
aqueous action long after the deposition, and in some cases 
after the folding and crumpling of the beds. In this 
respect they differ entirely from the lamine of Hozoén, 
which have been subject to the same compression and fold- 
ing with the beds themselves. 
The chrysotile veins have, of course, no connection with 
the structures of Hozoén, though they have often been mis- 
taken for its more finely tubulated portion. With respect 
to this latter, I believe that some wrong impressions have 
been created by defining it too rigorously as a “ proper 
wall.” In so far asI can ascertain, it consisted of finely 
divided tubes similar to those of the canal system, and 
