IV. EXPLANATIONS. 



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IV. EXPLANATIONS OF THE ORDINAL SUMMAEIES. . 



1 . Collective Census. — This designation is given to the first series of 

 orders because the flora is there regarded as a whole or total, without 

 reference to its local changes. The names of the orders are placed in 

 sequence according to the number of species for each of them, as given 

 by the ' Summary of Distribution,' and repeated in the column of figures 

 which _^w< follows the names. The number of species being equal for 



