Cc. A. BARBER. 11 
continuous bands of vessels pass down the axis of the 
sucker, separated by a well-defined pith and clothed on their 
outer sides by cambium(c). 
The cortex has undergone little change beyond its loss of 
contents. The collapsed layers are almost vertical and end 
downwards in the usual position. Lacune (/ac) have appear- 
ed opposite the up-turned wing of the host’s cortex, and the 
inward projection from the collapsed layers is much lower 
down than in Santalum album (Sant. II, Plates XIII, XTV, 
etc.). 
The nuclear cells are practically devoid of contents and 
show signs of breaking up irregularly (a). The sucker is dis- 
tinctly lobed and it is to be noted thatit is provided with secret- 
ing cells on its sides as well as at its end, the whole inner sides 
of the wings being coated with yellow secretion. A cap of 
clear yellow substance is to be found at the end of each wing 
(x) (see para. 10 and Plate VII, fig. 4, for the mode of forma- 
tion of this cap). 
It was stated in a recent paper (Par. Trees) that compound 
haustoria were to be met with among those of Cansjera Rheedii. 
This does not appear to be the case, and the section on which 
the remark was based appears, on closer examination, to be 
abnormal. This is one of the few characters of these hausto- 
ria in which they resemble those of Olax rather than Santalum. 
In the median line, where the sucker meets the wood of 
the host, the traces of a former gland may be made out (gl). 
The development of the haustorium of Cansjera Rheedii 
has thus been followed from an early stage to the mature 
organ, and the points of difference noted between it and the 
similar organs of Olax and Santalum. It will now be necessary 
to consider certain tissues in greater detail. In this study the 
arrangement followed in Olaz will best serve our purpose. The 
haustorium as a whole and the various tissues of the cortex 
and nucleus will be first examined, after which the vascular 
system and the sucker will be separately dealt with. Lastly, 
the effects produced upon the various roots attacked and their 
