70 



THE ANATOMY OF VEETEBEATED ANIMALS. 

 Fig. 23. 



Fig. 23.— A diagrammatic view of the Chief Trunks of the Cerebro- 

 spinal and Sympathetic Nervous Systems of Rana esculenta seen 

 trom below (twice the size of nature). I. The olfactory nerves. 

 N. Tlie olfactory sac. II. The optic nerve. O. The eye. L. op. 

 The optic lobes. Ta. Optic tracts passing from the optic lobes to 



