Plate I. Dorsal view of the brain of an adult albino rat four times natural 

 size. 



bo, olfactory bulb; cer. cerebral hemisphere; ch, cerebellar hemi- 

 sphere; ci, posterior colliculus; e, pineal body; pf, paraflocculus; 

 py, pyramis; sip, dorso-lateral groove; smp, dorsal median groove; 

 si, first cervical spinal nerve, dorsal root; s2, second cervical spinal 

 nerve, dorsal root; u, uvula; vr, vermis. 



