390 Miscellanies. 
agree in external characters with the rocks of the north, but contain 
petrifactions which have not yet been found in Scandinavia. Many 
of these petrifactions are amongst the most abundant which occur in 
the blocks. 3. A third class belong to rocks which are entirely 
wanting in the north, and the petrifactions which some of them con- 
tain are never met within Norway or Sweden. 4. The first only of 
those divisions of rocks can, with probability, have a northern origin 
assigned them ; in regard to the second it is more doubtful ; but we 
cannot admit such a view in regard to the third class, and that which 
is the richest in petrifactions. 5. The last cannot with probability 
be asserted to have been derived from the mountains which bound 
the South Baltic Plain. 6. Nor can they have come from moun- 
tain masses destroyed in their original situation. J. They cannot be 
supposed to have at an earlier period existed in the north, unless we 
assume what is very improbable. ‘Thus it appears that the result of 
my labors in regard to answering the question of the native country 
of the erratic block is almost a negative one. Itis doubtful ifa more 
intimate acquaintance with these masses will lead more speedily to the 
answer to this question than a fortunate hypothesis. It is certain, 
however, that complete investigations on the nature of erratic blocks 
will afford a secure basis for inquiries as to their origin, and it is there- 
fore to be wished that we should receive numerous and accurate con- 
tributions to our knowledge of the blocks of all parts of the South 
Baltic Plain. So much, however, is decidedly proved by my labors, 
that the great geognostical phenomena of the erratic blocks in the 
South Baltic Plain, cannot be explained by one simple event, and 
that much more complicated causes and forces must have co-operated 
than has hitherto been believed. It is equally evident that we stand 
at a greater distance from the solution of the problem than we imag- 
ined ; that apparently the key to the great riddle is not yet found, 
and that the question seems now less satisfactorily determined than 
ever.—Jameson’s Ed. New Phil. Jour., April, 1835. 
4. Analysis of the Fossil Tree seen at present imbeded in the Sand- 
stone at Craigleith Quarry, by Mr. Robert Walker.—Exposed to 
heat in atube, it gives off bituminous matter and water, and dissolves 
with considerable effervescence in diluted muriatic acid, carbonaceous 
matter being at the same time deposited. Its constituents are, car- 
bonate of lime, 50.36 ; carbonate of iron, 24.65 ; carbonate of mag- 
nesia, 17.71 ;. coal, with silica and water 6.15 ;=98.87.—Jb. 
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