434 » Scientific Intelligence. . 
lakes, are thus changed into sulphate of lime and constitute, with the 
clays in which they sink, brecciated argillo- gy pseous beds without strat- 
ification. That this fact should be equally apparent in the ancient beds 
under analogous circumstances, is at least what might be inka from 
the examination of that which passes in the lagoons. We should also 
observe the analogous positions of the boracite of Luneburg, Shae is 
found in — ppeanuariog | in gypsum intercalated in the midst of a 
These different facts well confirmed, establish in my view an intimate 
resemblance between the gypsum of the lagoons and the ab normal 
gypsum beds of secondary regions. 
If the silicification of the Macigno which we have noticed in th 
In pagent with this we ierva imbedded in a silicious coqient: nu- 
clei of a ite micaceous sandstone una a d at centre, causing @ 
breccia Dace his kind of breccia is finally, by the complete 
times the solution is more rapid, and then the rock is formed of an ag- 
glutination of little grains analogous to those of an ancient quartz rock 
and possessing its tenacity and hardne ess. Examined with a gia ea ach 
manent 5 pagans of silica effected at the expense of the macigno, 
are carr “ on upon a vast scale and over a space of great ener. 
a. Curator, Museum Economic Geokigy <-d te November 
meeting of the Asiatic Society, Captain Fitzgerald, B.A., resented for 
the inspection of the Society a model in lead of this remarkable stone 
and gave a brief note of its history, which will be found in my report 
pethes month. He has since favored me with a more detailed one, 
is as follows :— 
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