933 ANIMALCULA OF INFUSIONS. Xi 



jeSt is difcuffed in the laft chapter, part lo. of 

 the Contemplation, ' Organifed matter has re« 



' ceived 



< the plant. Marrow exifts in the bones of an animal 

 «■ during all its life; the medullary fubftance of plants xlif- 

 ' appears in a few years. Bones are connefted by mufcles; 



* plants have no moveable articulations- 



< There is nothing in plants correfponding to the fenfes 



* of animals. They have neither fenfation nor nerves ; 

 « and being deftitute of this principle of motion, as they 



* are without mufcles, we are neceflltated to afcrlbe the 



* particular motions fometimes vifxble to mechanical 



* caufes. 



« The courfe of the vegetable fluids is very different 

 « from the animal : there is no circulation, properly fo 

 « called, in plants. The juices imbibed by the roots afcend 



* and join thofe imbibed by the leaves : the rifing fluids 

 ^ do not refemble the defcending. There are no valves in 



* the vefTels of plants. 



* Animals have a principle which is the origin of their 

 « motions : the heart is the fpring of the machine, by im- 

 < pelling and preferving the impulfe of their fluids. Plants 

 ' have no organ fimilar, or which appears to fupply its 

 ' place. We cannot be certain that all their veflels are 

 « tubulous. Some, as the utricles, are Involved in each 

 ' other ; and thofe which raife the fap do not refemble 



* thofe that convey it back to the lower parts. Plants 

 *"have feveral fpiral veflels; animals have none fimilar : 

 « gnd if infers have tracheae, certainly they are very dif. 



♦ ferent 



