Reviews — Dawson's Acadian Geology, 



333 



of one's estimate of the systematic position of the plants he is dealing 

 with if it were obvious how far the structure he ascribes to them had 

 been found by him in sliced sections of prepared specimens of the 



FiQ. 2. 



A, Calamites Suckovii, Brongn., restored. 

 A'. Foliage. 



A*. Kibs and scars. 



A3. Roots. 



A*. Base of stem. 



B. Calamites Cistii, Brongn., restored. 



Bi. Leaves, 



B2. Leaf enlarged. 



C. Leaves of C. nodosus, Schlo:li. 

 Ci. Whorl enlarged. 



D. Structure of stem. 



E. Vessels magnified. 



