APPENDIX. 49 



A. Two feet 3 inches. 



B. Nil. The cleft separating this root into its two primary divisions reaching 



the upper surface of the central mass. 



C. Two feet. 



D. Two feet 2 inches. 



From the first to the second dichotomy. 



a. 5 feet 6 inches e. 6 feet 



b. 7 „ /. 4 „ 3 inches 



c. 6 ,, 6 inches g. G ,, 



d. 7 ,, h. 5 ,, 3 ,, 



From the second dichotomy to the uncovered end of each root. 

 I. 14 feet IX. None uncovered 



6 inches 



II. 



14 



III. 



22 



IV. 



7 



V. 



8 



VI. 



6 



VII.") 



' ~R,i< 



VIII. J 



' iilll 



X. 



Ditto 



XI. 



Ditto 



XII. 



Ditto 



XIII. 



Ditto 



XIV. 



Ditto 



XV. 



Ditto 



XVI. 



Ditto 



But a few inches 



Whilst, as this table shows, the prolongations of ten of the ultimate root- 

 branches were hidden by the rock into which they plunge, No. Ill shows what 

 may be expected of them whenever they are uncovered. This root ran in a 

 direction more favorable for exploration. I followed it therefore until 22 feet were 

 uncovered — which, with the addition of the other two segments, made a total 

 length of 31 feet 3 inches from the exterior of the base of the central stem, and 

 even this did not give us its entire length. Where we ceased to follow it the 

 root was so completely flattened, that whilst its breadth was 4 inches its maximum 

 thickness was only fths of an inch. Hence, in its uncompressed state, this root 

 can scarcely have exceeded 2^ inches in diameter. How much farther it extended 

 in length we have not yet ascertained. 1 



1 This root has since been traced to its termination, its entire length being 37 feet 4 inches. It 

 continued to be completely flattened to its apex, which also narrowed to a point. This specimen 

 throws light upon what has taken place in at least many of these root-terminations. After the 

 vegetable elements had floated out, as described at p. 25, some obstruction prevented the inor- 

 ganic sand, by which the cavity left by the disappearance of the organic material was filled, from 

 reaching the extremities of these narrowing tunnels. Thus deprived of all internal support, instead 

 of retaining their cylindrical form these cavities were crushed down by the weight of the superimposed 

 mud and sand, roof and floor being thus brought into close contact. la many cases all traces of these 

 terminations have ultimately disappeared. 



