EXPLANATIONS 



INTEODUCTORY TO THE THIRD VOLUME OF 



CYBELE BKITANNICA. 



The THIRD volume of the Cybele Britannica will continue 

 and conclude the distribution of species treated singly ; 

 and in so far it will be simi)ly a continuation and conclu- 

 sion of the two former volumes. A second portion of 

 this volume will be devoted to such corrections and 

 additions as increased knowledge may have rendered ne- 

 cessary, in reference to the distribution of the species 

 treated hi those former volumes. The distribution of the 

 whole series of species will thus be brought down to the 

 end of the year 1851. If sufficient space shall then re- 

 main, without rendering the volume inconveniently bulky, 

 a tabular summary will be introduced, designed to com- 

 press the leading facts of species-distribution into a 

 more condensed and selected condition, for the use of 

 Botanical Statists. 



Thus far, the three earlier volumes of Cybele Britan- 

 nica will differ much from the fourth and final volume. 

 In the concluding volume it is proposed to treat the dis- 

 tribution of plants under a different aspect ; that is to 

 say, not each one singly and apart, but the whole taken 

 in connexion ; in order that their individual peculiarities 



VOL. III. B 



