22 



Scientific Proceedings, Royal Dublin Society. 



100 c.c. (allowing for change in concentration) now reduces 1 - 1622 

 g. CuO. 



.-. 11622 - 1-0181 = 0-1441 g. CuO = 0-1138 g. maltose. Amount of CuO 

 reduced by hexoses therefore is 0-6970 - 0-1900 = 0-507 g. 



P. Commune, collected at noon, August 15. 



The following is an analysis of P. commune after three days in darkness. 



The great decrease in the total sugars, especially of the sucrose, is very 

 noticeable. Experiments were also carried out to show the distribution of 

 the sugars in leaf and stem. In order to bring into prominence the amounts 

 of the various sugars that are present in the assimilating and non-assimilating 

 parts of the plants, the tip of the stem, which contains a certain amount of 

 green tissue, has been placed aside, and does not figure in the analysis of 

 either leaf or stem. Owing to the time required to separate the leaves with 

 their sheaths from the stem, it has been impossible to express the results as 

 percentages, since inversion of sucrose would take place, if the separated 

 parts were kept till ready for weighing. It has, therefore, been necessary to 

 express the results of the analysis as ratios, 



