146 
Jeffrey. — Infranodal Organs. 
DESCRIPTION OF THE PHOTOGRAPHS IN 
PLATES VIII AND IX. 
Illustrating Dr. Jeffrey’s paper on Infranodal Organs. 
PLATE VIII. 
Photograph 1. Radial section through the wood of Abies balsamea , showing the 
course of a leaf-trace, x 30. 
Photograph 2. Tangential section of the subterranean stem of Polygonum 
amphibium. 
Photograph 3. Transverse section through the infranodal region of the stem of 
Potentilla palustris ; the woody cylinder is interrupted by parenchymatous stripes, 
x 8. 
Photograph 4. The same, showing one of the parenchymatous stripes more 
highly magnified, x 40. 
Photograph 5. Radial section through a parenchymatous stripe of the same 
species, which shows that it is situated below the medullary diaphragm, x 10. 
Photograph 6. Radial section showing the parenchymatous stripe more highly 
magnified, x 40. 
PLATE IX. 
Photograph 7. Tangential section through the wood of Potentilla palustris, 
showing two parenchymatous stripes (infranodal organs), x 10. 
Photograph 8. Superficial view of a split stem of Cicuta maculata , showing 
the infranodal lenticular organs ; the cortex and the bast have been macerated 
away, x 2. 
Photograph 9 Radial section passing through two nodes of the same species, 
showing the oblique course of the foliar bundle, x 7. 
Photograph 10. Transverse section through the region of exit of the foliar 
traces in Cornus stolonifera. x 10. 
Photograph 11. Transverse section of the same, some distance below the node, 
showing the indentations in the secondary wood caused by the leaf-traces, x 10. 
Photograph 12. Transverse section through the nodal region of the same 
species; the indentations have disappeared, x 10. 
