26 DESCRIPTION OF FOSSIL TREES DISCOVERED 



The following is the analysis of a portion of one of these fossils, weigh- 

 ing 20 grains : 



Carbonate of Lime, 16.65 



Carbon, 3.30 



Iron (Peroxide), 0.68 



Loss, 0.37 



20.00 grains. 



In Plate IV., the organic texture of these trees is exhibited as seen in 

 transverse slices, viewed by transmitted light. Figs. 1. and 2. are of the 

 natural size ; Figs, 3, 4, 5, 6, and 7. are magnified in various degrees. 



Fig. 1. Transverse section of one of the fragments of a fossil tree found 

 at Lennel Braes, of the natural size, shewing the organic parts a, a, imbed- 

 ded in the apparently cellular mass b, b, b, disorganized by crystallizations 

 of calcareous spar. The white lines, longitudinal and transverse, are veins 

 of calcareous spar. 



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 b, b, 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, high- 

 ly magnified. The former is distinctly seen to be composed of irregular 

 elongated cellules in several series. 



Fig. 7. Portion of the same organic texture, shewing part of a small 

 intersecting vein of calcareous spar. 



From these figures, it will be seen, that the general arrangement is si- 

 milar to that of the Coniferae, as exhibited in Plate I., there being regular 

 series of cellules, forming the woody texture, together with distinct medul- 



