Mar. 1900.] BOTANICAL SOCIETY OF EDINBUEGH 353 



EXPLANATION OF FIGURES. 



Plate I. 



Fig. 1. Early stage of root, the outer cells of the medullary ray 



dividing. The cells marked x are endodermal. 

 Fig. 2. Later stage cndodennis as before. Numerous pericyclic fibres ; 



thin-walled pericycle cell opposite root apex, dividing radially ; 



marked cells outside medullary ray tissue represent cells of the 



pliloem region which have become meristematic. 

 Fig. 3. Root showing three region .. Pericyclic fibre commencing to 



cut a groove in the apex ; endodermis not recognisable owing to 



growth in thickne.ss of stem. 



Pi.ATK n. 



Fig. 1. Formation of lenticular mass of secondary cortex opposite apex 



of root, which has already penetrated its base — ef, epidermis ; 



ck, cork ; pcj, phellogen ; en, pi'obable position of endodermis ; 



/>/(, phloem of stem ; xij^ wood of stem. 

 Fig. 2. Older stage of root. Mass of secondary cortex dotted and 



partially perforated by the root. 

 Fig. 3. Mature papilla. Secondary cortex entirely pierced. Root in 



restins: state. 



Contributions to the Flora of Spitsbergen, 

 ESPECIALLY OF Eed Bay, from the Collections of W. S. 

 Bruce, F.RS.G.S., Naturalist to the Prince of Monaco's 

 Expeditions of 1898 and 1899. By R. Turnbull, B.Sc, 

 Lecturer on Botany, School of Medicine, Edinburgh. 



(Read 8th March 1900.) 



In a former communication (9th February 1899) to this 

 Society, I gave an account of the flora of Hope Island, and 

 mentioned Mr. Bruce's first visit to Spitsbergen in the 

 Prince of Monaco's steel yacht, the " Princesse Alice," in 

 1898. Since the publication of that paper, I have learned 

 that Mr. Leigh Smith collected plants from Spitsbergen 

 and Hope Island, and a record of them is contained in the 

 "Journal of Botany," vol. xiv., 1876. 



Some of the plants in the present collection, were 

 gathered by Mr. Bruce in 1898, but most of them were 

 obtained during the second voyage of the " Princesse 

 Alice" to Spitsbergen, in 1899. 



An account of the two voyages, and a map of Spits- 



