EXTENSION OF THE ACOT YLEDONES. 17 



centre of organic vigour, from which the quickening 

 rays extend to all parts of the organic world. 



Few naturalists have as yet, when inquiring into 

 the localities of plants and animals, taken into con^ 

 sideration the respective region of the earth to which 

 each was particularly attached ; and this was most 

 neglected with regard to those plants and animals 

 which, in the Torrid Zone from the level of the sea 

 in ascendant direction to the snow-line, inhabit the 

 different elevations. Humboldt and Bonpland have 

 first shewn the way, by their admirable Picture of the 

 Andes. Many observations ought therefore to be 

 collated, in order to design, in our Picture, the spread- 

 ing of various orders and genera; yet it could some- 

 times be pointed out only at a probable rate : it may 

 therefore happen, that an order or genus is placed 

 either farther from or nearer to the snow-line than 

 they really are in nature. Such deviations, however, 

 will not, we hope, be particularly detrimental to the 

 use of the Picture. 



EXTENSION OF THE ACOTYLEDONES. 



1. All marine plants are Acotyledones ; amongst 

 which the wracks (fad), and the lavers (ulva), are 

 most abundant, and generally diffused. The former, 



