ILLUSTRATED BY FIGURES. 29 
PLATE IIL. . 
THE organic texture of the fossil tree from Lennel Braes, figured in 
Plate II. and that of a large trunk found in Craigleith Quarry, near Kdin- 
burgh, are here exhibited, as detected by the microscope. The figures are j 
all from thin slices, viewed by transmitted light. Two of them, Figs. 1, 
and 2. are of the natural size. The rest are magnified in various degrees. 
Fig. 1. Transverse section of a portion of one of the fragments of the 
fossil tree found at Lennel Braes, of the natural size, shewing the organic 
parts a, a, imbedded in the apparently cellular mass 0, b, b, disorganized by 
crystallizations of calcareous spar. The white lines, longitudinal and trans- 
verse, are veins of caleareous spar. This figure represents a thin slice, viewed. 
by transmitted light. 
Fig. 2. One of the organic parts, from another portion, represented of 
the natural size. 
Fig. 3. Part of one of these portions of organic texture, magnified about 
thirty-five times. 
Fig. 4. Portion of the same, more highly magnified, shewing a regular 
woody texture, and medullary rays. 
Fig. 5. Portion of the apparently cellular part 0, 0, of Fig. 1, magnified. 
The divergent crystallization of the calcareous spar is here distinctly seen. 
Fig. 6. Portion shewing a medullary ray, and the adjacent parts, highly 
magnified. The former is distinctly seen to be composed of irregular elon- 
gated cellules. 
Fig. 7. Portion of the same organic texture, shewing part of a small in- 
tersecting vein of calcareous spar. 
From these figures, it will be seen, that the arrangement is similar to 
that of the Conifere, as exhibited in Plate I., there being regular series of 
elongated cellules, forming the woody texture, together with distinct medul- 
lary rays. In these two circumstances, the texture is alike in the fossil 
