2 2 4 Barratt.—A Contribution to our Knowledge of the 
always present and is most conspicuously seen in transverse section in cones 
of the shape found in E. palustre. There the growth in length is relatively 
Text-fig. 20. Transverse section of bundle from cone of E. palustre. Note the carinal 
canal, x 275. 
Text-fig. 21. Transverse section of bundle from cone of E. maximum. Note the scattered 
arrangement of the metaxylem and the position of the protoxylem. x 275. 
great, bringing about a more complete rupture of the protoxylem and con- 
sequently the formation of small lacunae (Fig. 20). The relation between 
