CHANGES THAT OCCUR IN SOME CELLS 



OF THE 



NEWTS STOMACH DURING DIGESTION 



With a view to ascertain as far as possible the minute changes that 

 occur in the cells of the mucous membrane of the stomach during and after 

 activity, I procured towards the end of winter a number of newts (Tniton 

 cristatus) from England. 



When they arrived they were very emaciated and indeed in a starved 

 condition, having no doubt but recently awakened from their winter sleep ; 

 they appeared however quite healthy and swam well when placed in Avater; 

 took and retained food when given to them in the form of lively worms. 



Thèse English newts were fed at the same time with the same weight 

 of worm and killed at intervais after the meal; one being sacrificed every 

 twenty-four hours, to the end of the tenth day. Such long intervais were 

 allowed to elapse between each sample taken, because Langley'" states that 

 during winter in thin and emaciated animais that hâve been fasting for a 

 considérable time, changes in the gastric cells take place very slowly. 



Thèse constituted the first set of experiments. 



In June of the same year I procured a large number of fine Triton cris- 

 tatus from the -. Eft Pond - in the Braid Hills near Edinburgh. They were 

 in good condition and very lively. When worms were given them, they ate 

 them readily and were hungry again in less than twenty hours. However to 

 make sure that the stomach was quite empty and in a resting condition I al- 

 lowed an interval of a hundred and fourteen hours to elapse after the first 

 feeding and then selecting newts of about the same size and weight, fed 

 them a second time, each receiving the same amount of healthy worm. 



