416 Mr. Bowman on the Parasitical Connection 
which the bladders float, to minister to the support of the 
plant during the decay of the old and the formation of the new 
tubers. The scaly roots of Lilium candidum and the tunicate 
ones of Narcissus are provided with similar bladders in their cel- 
lular substance, which also are detached and sink in water. In 
the former they are smaller and more numerous than in La- 
threa; and those in the upper portions of the scales are chiefly 
concentrated round the fascicles of spiral sap-vessels. It is 
worthy of remark, that the cuticle of these scales has also no 
absorbents, nor do they become green by long exposure to 
light. | | 
I have already hinted, that the partial shade in which the 
Lathrea is always found cannot be the sole cause of its pale 
and sickly colour. Many other plants, which grow promiscu- 
ously with it, flourish, and severally possess their full and pecu- 
liar tints of green*. These all draw their nourishment imme- 
diately from the soil; have leaves furnished with cuticular pores, 
and are powerfully attracted by light. Not so our Lathrea; for 
. when its flower-stems have acquired their full altitude, they are | 
always perpendicular; and in groups of twenty or thirty in the 
most umbrageous situations, the rows of flowers (which have 
always an unilateral direction) are as frequently turned from 
the only side on which light is admitted as towards it. I have 
repeatedly witnessed this singular fact; and have even seen it 
come up within, though near the door of, a dark hovel, without 
the stem or its lowers evincing any tendency to incline towards 
the light. Again, it will be recollected that the various species 
of Orobanche and Cuscuta show no inclination to put on the 
usual vegetable robe of green, though not hidden “from day's 
garish eye.” It is therefore, I conceive, in the structure and 
* Such as Melica uniflora, Sanicula europea, Allium ursinum, Scilla nutans, 
Geranium Robertianum, &c. &c. » 
ie mode 
