DIRECTIONS FOR PLACING THE PLATES. 
Embryos of Clusiacee s 
Development of Vessels in Plants 
. . . 
. . . * 
Peachia hastata, and Thread-cells of Sagartia . . . 
Diagram of the relations of Actiniade 
32. | Species of Leucosiade 
END OF THE TWENTY-FIRST VOLUME. 
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