THE NEWTS STOMACH DURING DIGESTION 427 



EXPERIMENTS OF SERIES I. 



Fasting newt ten days after food. 



At the cardiac end the mucigen cups of the surface cells measure on an 

 average 14 :•>■ in breadth and 20 i'- in length, they stain of a pale blue colour 

 and are filled with granules of mucigen that are readily seen and not crowd- 

 ed together. The outer end of the cup is convex and projects beyond the 

 cernent ring, the inner end of the cup is also convex. The protoplasm beneath 

 the cup is in small amount and pale blue in colour without red granules. The 

 nucleus which nearly reaches the mucigen cup is large and measures on an 

 average 31, 33 X 8,48 i-^. The nuclear membrane is thin and pale blue. The 

 chromatin is arranged in streaks and dashes and fairly abundant, it stains 

 of a somewhat pale blue colour. The lanthanin granules are abundant, and 

 blue grey in colour. The nucleoli are for the most part small and venous red 

 in colour, they are placed near the extremities of the nuclei and in a few 

 cases ma)' be seen in process of extrusion. Internai to the nucleus the proto- 

 plasm exhibits some vacuolation and stains pale blue. 

 The cells measure in total length 56,0 \x. 



As the mucous membrane is followed towards the pyloric end of the 

 stomach, the appearances presented by the surface cells are seen to change 

 somewhat. 



The mucigen cups are flatter and less convex inwards, and their gra- 

 nules smaller in size and less distinct. Towards the middle of the organ 

 the cups measure 10,3 x i3,o i^-, that is to say they are broader than long. 

 The distance between the inner end of the cup and the nucleus is 2,66 i^ 

 and the pi^otoplasm has a finely vacuolated appearance without granules. 

 The nuclei also vary in appearance some being cloudy with numerous violet 

 coloured lanthanin granules and others clearer containing far fewer lanthanin 

 granules of a slate blue colour. 



The chromatin is in no case very abundant, the karyosomes being 

 mostly small and rounded with a pale blue coloration. The cloudy ones 

 measure 16,1 x ^>9' i>- being considerably smaller than the clearer nuclei 

 which measure 20,0 x 10.34 i-^. 



The nucleoli are small and not at ail numerous, some may be noticed 

 in process of extrusion. 



The inner ends of the cells are grey blue or pale blue in colour and are 



almost devoid of vacuolation, 



54 



