Dixon and Atkins — On Osmotic Pressure in Plants, Sfc. 303 



Table XVIII. 

 Si/rin.ga vulgaris': leaves. 



Quite comparable with the observations on the overshadowed leaves were 

 the results obtained with roots : — 



Table XIX. 



Syringa vulgaris : roots. 



Unfortunately in both tliese cases (viz., experiments 53, 54, and 75, 76) 

 the test was not made at tlie end of the first day ; and the possibility remains 

 that, if it had been carried out then, a rise might have been registered, as in 

 the other cases tested at the end of the first day, instead of the fall actually 

 observed at tlie end of the second and third days. 



Later on in the season— in pointof fact, towards tlie latter end of October — 

 we attempted to return to this problem, and we endeavoured to ascertain if 

 the rise of osmotic pressure took place to any extent in the sap after having 

 been extracted from the cells, and, if so, whether it would take place in tlie 

 sap freed from suspended matter by filtration. The results obtained on this 

 reinvestigation showed, as a rule, much smaller differences produced on 

 keeping the leaves and the sap, whether filtered or unfiltered. The more 

 stable condition in these cases may be attributed to the different condition of 



