DETERMINATION OF FOSSIL PLANTS. 5 



trated by a specimen of Araucaria imbricata, which was 

 destroyed by frost in the Edinburgh Botanic Garden on 24th 

 December 1861. The tree was 24 J feet high, with a circum- 

 ference of four feet at the base of the stem, and had twenty 

 whorls of branches. The external surface of the bark is 

 represented in Fig. 2. There are seen scars formed in part by 



Fig. 2. 



prolongations from the lower part of the leaves, which have 

 been cut off close to their union with the stem. The base of 

 each leaf remaining in the bark has the form of a narrow 

 elongated ellipse, surrounded by cortical foliar prolonga- 

 tions. The markings on the bark, when viewed externally, 

 have a somewhat oblique quadrilateral form. On removing 

 the epiphloium or outer bark, and examining its inner 

 surface, we remark a difference in the appearance presented 

 at the lower and upper part of the stem. In the lower 

 portion the markings have an irregular elliptical form, with 

 a deep depression, and fissures where the leaves are attached 

 (Fig. 3). Higher up the epiphloeal markings assume rather 

 more of a quadrilateral form, with the depressions less deep, 

 and the fissures for the leaves giving off prolongations on 

 Fig. 2. Bark of Araucaria imhricata. 



