204 Canadian Record of Science. 
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Fic. 3. Coral System of Hozoon injected with serpentine (magnified). 
Fic. 4. Very fine canals and tubuli filled with Dolomite (magnified). 
(From Micro-photographs.) 
injected with a hydrous silicate. This is a filling up by no 
means infrequent in later fossils, and as Dr. Carpenter has 
shewn, it is going on in the modern seas in the case of 
foraminifera and other porous tests and shells injected with 
glauconite. Numerous instances of this kind exist in 
Paleozoic limestones. Several of these are described in my 
paper on fossils mineralized by silicates (Jour. Geol. Society, 
Feb. 1879, et infra), and I have recently met with another 
interesting example in a limestone from the Lower Carboni- 
ferous of Maxville, Ohio, collected by Prof. E. B. Andrews. 
and presented to me by Dr. T. Sterry Hunt, in which many 
crinoids and corals are beautifully injected with a greenish 
hydrous silicate resembling glauconite. 
Mineralization of this kind is in reality greatly less 
complex than that in which, as in many fossil corals and 
fossil woods, the calcarerous or woody matter has been 
entirely removed and replaced by silica, oxyde of iron or 
pyrite. In many cases also in Paleozoic fossils the cavities 
have been filled with successive coats of different minerals 
