INTRODUCTION. 
On this question, therefore, as there can scarcely be two opinions, it now only remains for me 
he arrangement followed is very nearly that of Jussieu as modified by DeCandolle and 
adopted in his Systema,and Prodromus. According to this system all plants are first d n- 
tute of spiral vessels and of Cotyledons—Cettucares ; the latter, including all the flowering 
plants which are furnished with both these organs—Vascucares. The vascular plants, of which 
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