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numerous roots the mud is deposited. Young mangrove plants are often 

 seen growing in the West Indies on coral reefs where the water 

 is quite clear and fresh. This I have seen at its best at the en- 

 trance to Road Harbour on Tortola. And in the Saltriver Bay on 

 the north side of St. Croix Rhizophora was found growing on 

 the bare rocic without any mud whatever. 



Fig. 3 shows a young BhizophoraAree growing on rocky sub- 

 stratum in the little bay behind Christiansfort on St. Jan; below 



Fig. 4. Rhizophora-vegeiaiion in the Saltiivei- Bay on the north side of St. Croix. 



(F. B. phot.) 



on the left the rock is seen. But as the edge of the mangroves 

 gradually grows in breadth more mud is deposited among the 

 roots. 



Fig. 4 shows such a somewhat more advanced stage in the 

 Saltriver Bay, on St. Croix. The rocky coast itself is not shown 

 in the picture, but it is at a short distance from the left side of 

 the picture. The Bhizophora-xegeiaiion as yet consisted only of a 

 single or some few rows of trees, but these extend more and 

 more into the water, while, as is shown in the picture, vigorous 

 roots which descend vertically, or almost vertically, are growing 



