gSo 
Carter.—-A Reconsideration of the 
sought for, but as the individuals examined were about six months old and 
had their cotyledons well developed, these beginnings were not found. 
Thuja orientalis , var. aurea , however, of which younger specimens were 
available, showed them well, and they were invariably found to be lateral 
(Fig- 4 )- 
12 . T. spheroidea , Spreng. The transfusion tissue begins with a single 
large typical element at the side of the bundle. Such an element is very 
much bigger than those forming the xylem, and quite unmistakable. 
Fig. 4. Thuja orientalis, var. aurea. Transverse section of cotyledon, showing transfusion 
tissue arising first at the side of the bundle, t.t., transfusion tissue ; pxy, protoxylem. 
13. Juniperus communis , L., had a few transfusion tracheides, though 
none were seen in the adaxial position. 
It is therefore seen that the above questions may be answered as 
follows— 
1. In no case are the earliest formed tracheides in such a position 
that they may be regarded as surviving links between a vanished mass 
of orthodox centripetal xylem and a modification of this tissue which 
has gradually become more abundant at the sides of the bundle. 
2. The transfusion tissue is never more abundant in the adaxial position 
in the cases examined. Indeed, it is only in Cephalotaxus and in Thuja that 
more than one element is found on the ventral side, and in the latter, at any 
rate, it arises there later than in the lateral position. 
