THE NEWTS STOMACH DURING DIGESTION 445 



the pale blue grey, slightly vacuolated inner ends of the cells the lymph 

 spaces are of moderatewidth. 



i8 Houvs afterfood. 



The cells at the cardiac end rcsemble thèse of the previous hour, but 

 the nuclci are possibly rather nearer the cups and the chromatin is more 

 abundant, the lanthanin is not veiy abundant and slate blue, the nucleoli 

 are small and extrusion appears to hâve ceased. The lymph spaces are wide 

 both between the cells and in the subjacent tissue. 



At the pyloric end the cells are much the same but a few red staining 

 granules hâve now made their appearance in the protoplasm between the 

 nuclei and the cups. 



1 9 Hours after food. 



The mucigen cups at the cardiac end are plump looking, convex at both 

 extremities and project well externally; they contain numerous small blue 

 granules. Between the cups and the nuclei more red granules hâve appeared, 

 especially at the sides of the cups. The nuclei fill the cells laterally and hâve 

 thin blue envelopes to which little chromatin adhères. The chromatin 

 within the envelope appears concentrated into fairly abundant, deep blue 

 karyosomes of somewhat small size. The lanthanin is abundant, small and 

 dark grey. The nucleoli are small, venons red and surrounded by a tiny 

 space free from lanthanin. The inner ends of the cells are separated by 

 médium size lymph spaces, are blue and devoid of granules. 



The cells hâve nearly come to rest. 



At the p3'loric end the cells resemble thèse but are slightly less advan- 

 ced, their red granules being fewer in number. 



From thèse experiments the following points may be deduced. 



The surface cells of the stomach like thèse of the oxyntic glands exhibit 

 a period of activity followed by a period during which repair is effected, but 

 the repair seems to be less complète, to judge by the number of red granu- 

 les produced, than is the case with the gland cells; that is to say, that the 

 cells enter into a second period of activity before their stock of red granules 

 has had time to become as great as it was before the ingestion of food. Prac- 

 tically the cells undergo the same séries of changes exhibited by the oxyntic 

 cells with this différence that the mucigen never appears to be entirely 



