220 Parkin . — The Extra-floral Nectaries of Hevea brasiliensis 
more than two or three each. Whether or not the possession of a large 
number of these scales be a common feature of young Hevea shoots cannot 
well be decided from the few examined, but the supposition is that such 
a shoot as the one shown in Fig. 2 is exceptional, and that as a rule 
only two or three non-nectariferous scales occur. 
The nectariferous bud-scales . These vary considerably in number. 
The average for twenty-two shoots of adult trees examined was seven, 
ranging from five to twelve. The shoot from which Fig. I was drawn 
possessed eight, while that of Fig. 2 was exceptional in having twelve. 
Naturally, only part can be represented in the drawings. The lower 
nectariferous scales are small and short. The middle ones are usually 
the largest and possess the best developed nectaries, while the upper 
ones, though quite as long, are not so thick, and have the honey-secreting 
part reduced in extent ; in fact in the uppermost one of all this part 
may be restricted to the apex, or perhaps even absent. The internodes 
increase in length as a rule from the base upwards ; thus the lower 
nectariferous scales are near together, while the upper ones are some 
distance apart. 
The inflorescences are borne in the axils of the nectariferous scales 
as well as in those of the lower foliage leaves (Figs, i and 2 ft). 
Sapling. The young shoots of saplings resemble in most respects 
those of the adult trees, but being longer the internodes between the 
middle and upper nectariferous scales are more marked. From an ex- 
amination of thirty-eight young sapling shoots the following numbers 
were obtained : — 
non-nectariferous basal scales ranged in number from 0-3, aver. 1. 
nectariferous scales ,, „ 4-7, „ 5. 
foliage leaves — average 10. 
Nine of these thirty-eight young shoots possessed each an arrested 
leaf between the nectariferous scales and the foliage leaves proper. This 
bore three leaflets well defined but quite small, while the nectariferous 
scales have mere points to indicate the remains of the leaflets. The 
nectary appeared to be absent 1 . This vestigial leaf did not persist, but 
withered and fell off with the scales. 
Seedling. In germination the two cotyledons remain in the testa 
in the soil, so that what looks like a hypocotyl is really the epicotyl ; 
it is quite long, 25 cm. or so in length. The first two foliage leaves formed 
quit the stem about the same level, and are similar in shape to those 
of older plants. Then comes an internode of about 3 cm., followed by 
two more foliage leaves situated at nearly the same level on the stem 
and alternating with the first pair ; sometimes there may be only one 
1 Not microscopically examined — might possibly possess a trace of glandular tissue invisible 
to the naked eye. 
