412 
Dixon and foly . — The Path of 
vessels streaming upwards from below like a sheaf of fine 
white threads. The examination of these threads under the 
microscope reveals many features of interest. Woodcuts 3-5 
represent portions of some of these casts. 
Some further experiments were made bearing upon the 
ascent of water in the wall. All confirm the fact that an 
appreciable quantity of water ascends in branches most care- 
fully choked with paraffin. 
Woodcut 5. — Cast of Elm. 
Thus while flagging will inevitably overtake a paraffined 
branch left furnished with the same number of leaves as it 
bore upon the tree, yet if the greater number of these are 
removed the remaining leaves will generally hold out fairly 
well. This experiment was tried with a control paraffined 
branch upon which all the leaves were left standing. 
If after injection we remove part of the branch at a fork 
