BP rat as aa FO fon ie a SEES Sh « 
1913] HEMENWAY—SIEVE-TUBE 243 
EXPLANATION OF PLATE XI 
1G. 1.—Transverse section of phloem of Acer macrophyllum, showing 
horizontal bands of hard bast and general view of sieve-tubes and parenchyma 
cells 
Fic. 2.—A similar view of Alnus incana, showing that the hard bast 
occurs chiefly opposite the aggregate rays. 
Fic. 3.—A similar view of Quercus Garryana, showing distribution of 
hard and soft bast. 
Fic. 4.—Transverse section of stem of Ranunculus fascicularis, showing 
scattered bundles and relatively small amount of phloem. 
Fics. 5 and 6.—Chenopodium album (fig. 5) and Amaranthus paniculatus 
(fig. 6), showing peculiar scattered bundles that might suggest relationship 
to the monocotyledons. 
