No. 2.] ON- THE GUSTATORY ORGANS. 1/3 



The apex of the tongue is obtuse, and the under surface smooth 

 and unmarked by ridge or groove. Papillae of the fungiform type 

 are thinly distributed over the dorsum. They appear to be of 

 normal structure. The circumvallate papillae, three in number, 

 are situated on the same transverse line. They are very near 

 together, and are 3.5 mm. distant from the base of the organ. 

 The lateral gustatory organs are quite far forward. A line 

 dividing the circumvallate papillae at their centres, if continued 

 on to the under surface of the tongue, would pass through the 

 posterior limits of the lateral taste organs. 



Gustatory Structures. 



The Circtimvallate Papilics. — The papillae are 0.44 mm. in 

 diameter and 0.35 mm. in height. They are flattened on top, 

 and frequently cleft at the centre. Their sides are quite sym- 

 metrical, and at the lower part bend slightly inwards. The 

 trench encircling each papilla is deep and narrow. Serous 

 glands are not very plentiful in the underlying stroma. The 

 ducts open into the trenches at their deeper part. The bulbs 

 are disposed in five or six tiers, filling completely the overhang- 

 ing wall of the papilla. There are about fifty closely packed 

 bulbs in a tier. They are fairly uniform in size, measuring 

 0.051 mm. in length and 0.029 ^nm. in breadth. 



The Lateral Gustatory Organs. — The organs measure 2.10 

 mm. in length, and consist of seven or eight bulb-bearing folds. 

 The folds are quite simple in construction, but vary somewhat 

 in size. They are separated by deep and narrow furrows, the 

 average depth being about 0.40 mm. Serous glands are not 

 abundant. Their ducts open at the usual places. The bulbs 

 are arranged in six to eight tiers, filling the lower half or lower 

 two-thirds of the folds. They measure 0.048 mm. in length 

 and 0.024 mm. in breadth. 



All of the fungiform papillae examined contained bulbs. One 

 vertical section of a papilla showed two of equal size, measuring 

 0.039 rnm. in length and 0.030 mm. in breadth. They were 

 placed obliquely near the summit, with their bases resting in 

 a depression of the mucosa, and their apices directed upwards 

 and slightly outwards. 



Bulbs were present in the epiglottis and occurred elsewhere 



