CIRCULATION IN THE TONGUE. 



159 



26, a) and about one-eighth of an inch thick, being 

 fastened with pins over the slit which served for the 

 display of the frog's web. 



Fig. 27. 



Structure and position of the tongue of the toad (Dowdeswell). 



A. Transverse section through the middle of the organ with the lymph-spaces 

 fully distended ; a a, thick, papillated mucous membrane ; b, tbin lower 

 membrane; m, muscular bundle cut across, united to the sides of the tongue 

 by septa of connective tissue 8 ft; v, position of the larger bloodvessels. 



B Profile view showing the tongue in its ordinary position within the mouth. 



C. The same when extended. 



The toad having been rendered insensible and 

 curarized as before is laid upon its back with its 

 nose close to the slit. The lower jaw is then raised 

 and the folded-back end of the tongue is found, and 

 drawn gently out of the mouth with forceps. The 

 end has a pointed projection or cornu on each side ; 

 these are successively laid hold of by the forceps. 



