316 KINGSLEY: SPLITTING OF RHIZOME OF DELPHINIUM 
tinuous ring about each of the segments into which the rhizome 
is thus divided. The tissues cut off in this way become necrotic. 
Columns formed are each surrounded by an active cork-forming 
periderm, they continue an independent existence and never 
exceed the number of the original bundles. 
This anatomical study of the rhizome and root of Delphinium 
scaposum was carried on in the Botanical laboratories of Barnard 
College, Columbia University, under the direction of Dr. Herbert 
M. Richards, to whose inspiration and helpful suggestions the 
success of this investigation is mostly due. The writer wishes 
also to express her thanks to Dr. D. T. MacDougal for furnishing 
the material, and to Dr. Tracy E. Hazen and Dr. P. A. Rydberg 
for their assistance in determining the identity of the plant studied. 
BARNARD COLLEGE, 
COLUMBIA UNIVERSITY. 
BIBLIOGRAPHY 
De Bary, A. Comparative anatomy of the Phanerogams and Ferns. 
Eng. Transl. Chapter 16. 1884. 
Greene, E.L. New Species of Plants from New Mexico. Bot. Gaz. 6: 
156-158. 1881. 
Huth, E. Die Delphinium-arten der Vereinigten Staaten von Nord- 
Amerika. Abhand. und Vortrage aus dem Gesammtgebiete der 
Naturwissenschaften 4: 9. 1892. 
Jost, L. Die Zerkliiftungen einiger Rhizome und Wurzeln. Bot. 
Zeit. 48: 433-446, 453- 462,469-480, 485-493, 501-512. pl. 6. 1890. 
Koch, L. Untersuchung iiber die Entwickelung der Crassulaceen. 
Heidelberg. 1879. 
Explanation of plates 13 and 14 
G. 3. Cross section of primary aerial stem, showing regular primary struc- 
ture, bundle ring, hollow center, stereome. 
Fic. 4 ross section of rhizome in second year, showing irregular outer paren- 
chyma with groups of stereome, outer endodermal ring separating regular and ir- 
regular cortex, cambium ring between 2nd xylem and phloem, slight necrosis around 
hollow center. Space outside rst xylem shows ring of ‘‘fall”’ parenchyma cells. Peri- 
derm formed. 
F 
IG. 5. Cross section of rhizome in third year, showing inner endodermis 
cutting off xylem of first year with oeioeed irregular parenchyma and necrotic pith. 
Outer endodermis projected betw strands r endodermis, dividing 
the rhizome into two parts. Other grooves appear in outer £ chdbturntie indicating 
subsequent divisions. 
