180 Blackburn . — On Vascular Anatomy in some Ranalean Forms . 
EXPLANATION OF PLATE XIII. 
Illustrating Miss Blackburn’s paper on the Vascular Anatomy of the Young Epicotyl in some 
Ranalean Forms. 
Taken from photographs. 
M 1 L 1 , M 2 L 2 refer to the median and lateral traces of successive plumular leaves, cot. is the 
cotyledonary trace. . 
Fig. i. Aquilegia alpina. Transverse section at the first plumular node, showing the beginning 
of cambial growth. The cotyledonary tube has been removed, x ioo. 
Fig. 2. Aquilegia canadensis. Showing the arrangement of vascular strands at the cotyledonary 
node, x 80. 
Fig. 3. Delphinium occidentale. Transverse section of the stem at the first plumular node, 
x 32. 
Fig. 4. Ranunculus acris. Transverse section at the second plumular node, showing cambial 
growth. A few primary xylem elements are differentiated and there is some tangential stretching, 
x 40. 
