* 
DR. HARLEY ON THE PARASITISM OF THE MISTLETOE. 189 
ACER CAMPESTRE. 
Ray very large, an elliptical fasciculus, the ẹẹth of an inch deep and the z35th of an 
inch wide, composed of five or six rows of ae Rays overlapping each other above and 
below, distant transversely about half their width. 
ILEX AQUIFOLIUM. 
Ray very large, average size same as that of Maple, an elliptical fasciculus, composed 
at the widest part of four rows of cells, the cells being very large. Rays arranged linearly 
and a little overlapping each other above and below, but separated on ee by wide 
intervals equal to three or four times the width of ray. 
SAMBUCUS NIGRA. 
Ray a broad elliptical fasciculus, sth of an inch deep and gğpth of an inch wide, com- 
posed of three rows of large cylindrical cells. The rays overlap, and are distant about 
their width ; they closely resemble those of the Maple, differing only in forming nar- 
rower ellipses, in having the constituent cells larger, and in being a little further apart. 
FRAXINUS EXCELSIOR. 
Ray an elliptical fasciculus, the 335th of an inch deep and the 7 j55th of an inch wide, 
composed of about fifteen large cylindrical cells arranged in two rows. The rays do not 
overlap, and are distant laterally about once or twice their breadth. 
OLEA EUROPAEA. 
Ray an elliptical fasciculus, ;1;th of an inch deep and gğpth of an inch wide, 
composed of twenty cylindrical cells, some of which are very large, arranged in two rows. 
The rays a little overlap, and are distant laterally scarcely their width. The wood only 
differs from that of Ash in the larger size and closer approximation of rays. 
SYRINGA VULGARIS.—LIGUSTRUM VULGARE. 
Ray a very narrow elliptical fasciculus, ;35th of an inch deep and rsyoth of an inch 
wide, composed of about sixteen small cells arranged in one or two rows. Rays distant 
about thrice their width. 
CRATJEGUS OXYACANTHA.—PYRUS MALUS. 
Rays elliptical fasciculi, rğgth of an inch deep and sğpth of an inch wide, composed 
of two or three rows of cylindrical cells. Rays crowded, often contiguous longitudinally, 
distant laterally about their width. 
VOL. XXIV. 2c 
