LAWS OF MOTION. 423 



vegetables, and in the more simple animals, the 

 blood of both is conveyed to the different parts 

 of the system, by vessels, whose difference seems 

 principally to consist in the nature of their form, 

 whether spiral or straight ; until the fabric of 

 this organ increases in power and complication, 

 from a crypta, or one single cavity only ; after 

 which it is found gradually to increase in its 

 complication, with additional power, by the aid 

 of a heart : iii fish the heart has two cavities ; 

 in the amphibia it has three, and in the mam- 

 malia it has four. 



If we were to trace the gradation which ex- 

 ists, in that wonderful system, which distin- 

 guishes the animal from the vegetable species, 

 and which is placed, (as PROFESSOR HARWOOD 

 elegantly expresses it,) "in the doubtful confines 

 of the material and spiritual worlds," and more 

 especially in the attributes which flowfrom it, of 

 intellect and of soul; we should be compelled to 

 acknowledge, that the earth below, is con- 

 nected, with the heavens above, by different links 

 of one vast chain, which extends from the first 

 to the last of things, forming altogether one 

 perfect whole. We should conclude, that this 

 universal whole, is the work of a Divine Artifi- 

 cer, who created it, in the best possible manner, 

 to answer the ends for which it was especially 

 designed ; that it is with a view to subserve 

 those ends, that we behold every particle of 



