356 



ZOOLOGY 



was once regarded by a philosopher as the seat of the soul, 

 on the ground that the soul is a unit and that the pineal gland 



Fig. 334. — .Ser'tion of the pineal ej'c of a lizard (Hattcria) : c. cornea; 

 /, lens; h, c:\\'\\y of c^'cljall ; /', ?•', retina; .r. celld in ytalk ; .s7, stalk; 

 (7, Mooil-\-(',ssi'l.s. After Spencer. 



is unpaired. ^Ye now know that it is the rudiment of a once 

 functional eye. 



The lizards (Sauria) constitute a large order characteristic 

 of the trojjical and subtropical countries, aiid reaching the 

 maximum of its development in South America, while in the 



