Shaw. — The Seedling Structure of A raucaria Bidwillii. 323 
The above account only represents the course of the vascular bundles in 
a general sense ; as a matter of fact, hardly any two seedlings seem to agree 
precisely in the manner in which the bundles in the hypocotyl are differen- 
tiated out of those from the cotyledons and plumule. Numerous specimens 
were investigated in the hope of establishing the relationships between the 
bundles appearing in the hypocotyl and those entering from the cotyledonary 
tube. As a general rule, owing to the complete fusion of cotyledonary and 
plum u la r strands, and the large amount of secondary thickening, it is 
impossible to trace any one bundle in the hypocotyl back to a particular 
bundle in the cotyledonary tube. In two specimens, however, the cotyle- 
donary bundles seemed to preserve a certain amount of individuality 
throughout their fusion with the vascular tissue from the plumule ; here, 
accordingly, it was possible to trace them into connexion with those in the 
hypocotyl. 
In one of these seedlings (Diagram III, Fig. 1) fourteen bundles ( c.b .) 
entered the hypocotyl from the cotyledonary tube ; they were arranged in 
a ring of four groups of three bundles and one group of two bundles. These 
five groups of bundles fuse with the plumular strands, each group as it does 
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