DixoN — Vitality and Transnussion of Water througli Plants. 21 



Particulars of Experiment. 



A and B, two similar branches of Sijringa vulgaris, each with five year- 

 rings. 



A: length, 84'5 cm. long. Upper diam. of wood, 0'8 cm.; of pitli, O'lo 

 cm. Lower diam. of wood, 0'9 cm. ; of pith, 0'23 cm. Head, 9'0 cm. 



B: length, 83"5 cm. Upper diam. of wood, 0'73 cm.; of pith, 0"1 cm. 

 Lower diam. of wood, 0'85 cm. ; of pith, O'l cm. Head, 9'3 cm. 



Table I. 



The cistern was emptied, and B surrounded with steam from iii o'clock to 

 iii. 20. When the cistern was refilled and stirred, the measurements were 

 resumed. 



Immediately after the experimental branch is surrouuded witli steam, the 

 water transmitted through it becomes coloured, at first amber, changing to 



