40 OBSERVATIONS ON FOSSIL VEGETABLES. 
about fifty-five times. 'The calcedonic mode of crystallization is observed at 
the lower part of the figure. 
Fig. 14. Fossil silicified wood, from Antigua, probably dicotyledonous, 
and resembling Fig. 10. of Plate I. 
On comparing Figs. 11, 12, 13, and 14. of this Plate, with Figs. 7, 8, 
§, and 10, of Plate I., it will be seen that the general resemblance is per- 
fect; and that there can hardly remain a possibility of confounding the 
structure of the dicotyledonous trees with that of the Gymnospermous pha- 
nerogamic. 
Figs. 15, and 16. Represent portions of silicified monocotyledonous 
wood from Antigua, and may be compared with Figs. 11. and 12. of 
Plate I., which exhibit the same structure. They are enlarged about fifty- 
five times. 
Since the drawings have been finally arranged, I have received from my 
much esteemed friend, Mr SrncLarr of Ulbster, a specimen of fossil wood, 
which proves to be one of the Conifere. The following is a brief account 
of it. This tree was found in 1829, in a quarry in Portland Island, about 
200 feet above the sea, and about 10 feet below the surface of the ground. 
Immediately over it was a bed of roofing-slate; and above the slate a bed 
of stone about two feet in thickness. The trunk of the tree is 24 feet in 
length, and divided into two remnants of branches, about four feet long 
each. The stem measures four feet in circumference, just above the root, 
and the whole of it is rather oval than round, apparently from the pressure 
of the materials above it, as it was found in a horizontal position. 
2 
