X. CONTENTS. 



Plants, sexual system of, 27 



- sleep of, ib. 



Quadrupeds, their conformation, - 48 



-- their remarkable instincts, 51 



-- their uses, 53 



Quicksilver, its uses, &c. - 8 



Rainbow, beauty of, - - 177 



Religion, a sense of, the peculiar characteristic 



of man, 4 



Reptiles, their structure, &c. - 91 

 -- their motion, - -92 



- their use, - 97 



substances and sulphureous bodies', * 9 



Sea, its vast extent and bounds, 99 



a source of fertility to the land, 103 



a purifier and restorer of nature, - - 104 

 -- currents of the, 105 



contains the greatest quantity of salt in the 

 torrid zone, - - ib. 



- saltness of, how beneficial, 109 



colour of, deception relative thereto, - 1 14 



- vegetable productions found at the bottom of, 119 



- vegetables, the use of, - 123 

 Sea-horse of the northern ocean, 50 

 Sea-tortoise, its instinctive sagacity, - - 132 

 Seasons, changes of the, and vicissitudes of day 



and night, how produced, - 183, 185 



--- beneficial effects in the changes of the, 186 



Serpents, some peculiarities relative to, 93 



-- their poison, &c. 94 



i -- : - wonderful sagacity of, 96 



