38 ON THE AWNS OF NEPAUL BARLEY. 
represented at fig. 21, 25, &c.; and as the same letters always indicate 
similar parts, I need not dilate on them. In cases where the influence 
producing the bud appears greatly to have exceeded that which has ex- 
tended the awn, the apices of the wings are directed forwards, and often 
run out in the form of two long lateral awns, fig. 29. Their margins 
sometimes becoming adherent to the appendages of the bud, the cucullus 
partakes more of the character of these appendages, and is highly 
membranous, with little or no pubescence, fig. 29, 30. Some modifi- 
cation of these conditions causes the apex of the awn to become reflexed, 
as we see in fig. 31 to 35, where the wings (partaking of a highly 
membranous character) and the strongly reversed direction of the 
pubescence on the back, indicate the superior influence of the bud over 
that of the awn. At fig. 34, the awn seems to have recovered (as 
it were) its influenee, and to have run out to some extent beyond 
the base of the bud, but in fig. 35, it has been stopped abruptly, whilst 
the middle scale of three which have been developed at the base of the 
bud, has run out to a considerable length, and terminates in a very 
distinct awn. But these modifications are endless. 
Having observed how strong an influence the bud produces upon the 
tissue which strictly forms a part of the awn, both by extending it 
laterally into ** wings," and by causing the hair on the back of it to 
take a reflexed direction, it was no surprise to find examples upon 
which the developing axis of the bud had exerted a still greater in- 
fluence upon the back of the awn than upon the front; and had 
caused the cucullus formed by the wings to assume a reversed or dorsal 
position. Fig. 36 is the front, and fig. 37 the back of an awn thus modi- 
fied, whilst fig. 38 has the reversed eucullus removed. We here find the 
apex of the “basial” leaf rather more distant than usual from the 
wings, and scareely any further traces of the bud on the upper surface. 
But on the back, the base of the bud is distinctly marked by the pro- 
trusion of a mamillary mass of cellular tissue, and its apex appears also 
to be determined by the protrusion of another such mass a little below 
the place where the basial leaf (on the opposite side of the awn, fig. 36) 
is attached. The midrib of the awn is unusually thickened, and the 
hair upon it strongly reflexed. Here the developing axes of the awn 
and bud appear most completely blended, but are still exerting their 
respective influences in diametrically opposite directions. 
