Origin of ‘ Transfusion Tissue\ 979 
10. C. torulosa , D. Don. These sections showed no transfusion 
elements, or only one near the side of the bundle. 
11. Thuja orientalis . This is an interesting subject, as in large 
cotyledons a good deal of transfusion tissue is present, and it extends 
pxy 11 
Fig. 3. Thuja orientalis. Transverse section of cotyledon from plant six months old, showing 
much transfusion tissue, t.t ., transfusion tissue; pxy, protoxylem. 
in a more or less complete chain across the adaxial side of the xylem, 
as well as appearing at the sides (Fig. 3). If this sort of condition only were 
seen, it would appear very reasonable to suppose that centripetal wood (which 
was, however, not observed in this genus) had given rise by modification 
to these tracheides. The beginnings, therefore, were all the more carefully 
