CONTENTS 
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I. Of the Alge generally 1 
II. Of the Diatomacee 11 
III. Of the Free Diatomacee .... 14 
IV. Of the Stipitate Diatomacee . . . 30 
V. Of the Characteristics of the Diatomacee . 37 
VI. Of the Desmidiacee, and some similar minute 
Alge .50 
VII. Of the Filamentous Alge 62 
VIII. Of the Oscillatorie 76 
IX. Of the Gelatinous, Crustaceous, and Stone-like 
Alge 82 
X. Of the Marine Alge , . ... 89 
XI. Of the Characee 107 
XII. Of the Fungi 115 
XIII. Of the Lichens . . . . . . .132 
XIV. Of the Mosses and their Allies . . . .139 
XV. Of the Ferns and Flowering Plants . . .154 
XVI. Of the Herbarium . , . . • .174 
