THE MICROSCOPE. 



assisted eye ; and, without desiring to go far into the field of the 

 speciaHst, would yet be glad to push his investigations beyond the 

 limit he has reached. Just here the microscope comes to his aid. 



A recent study of the vagus nerve and its relations in the do- 

 mestic rabbit (Lepus cuniculus, Linn.) may serve to illustrate the 

 proposition. The portion of the nerve considered was in the tho- 

 racic region between the arch of A. aorta and the diaphragm. 



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FIG. Diagram to show di- FIG. 2. Diagram to show FIG, 3. DiaRTam of chias- 

 ▼isionofN. vagus in the cat. the prevailing plan in the rab- m us vagus in rabbit. 

 D, N. vagus dexter; S. N. vagus bit; nomenclature as in Fig. i ; 

 sinister; L., lateral rami; mesiil d. p., dorso-pulmonary region; 

 rami ; dor., dorsal trunk which d. o.,dorso-u;sophageal region, 

 becomes the dorsal gastric 

 nerve caudad of diaphragm; 

 ven., ventral trunk. 



The typical arrangement of this nerve is found in the cat (Felis 

 domestica,) or the dog (Canis familiaris, Linn.). In the dorso-pul- 



