SIR J. LUBBOCK—PHYTOBIOLOGICAL OBSERVATIONS. 63 
becomes more marked (fig. 137), and by the tenth day the new 
portion is obtusely 2-toothed or crenate, and nearly equals the 
original cotyledon in size. 
Fig. 136. Fig. 137. 
Fig. 136. Seedling of Eucharidium grandiflorum. X3. 
Fig. 137. Eucharidium grandiflorum: 10 days after germination. x3. 
In its final form (fig. 138) the new portion is both broader and 
longer than the true cotyledon, and differs from it not only in 
the crenations, but in the possession of a more conspicuous midrib 
and rather stiff hairs. Not only is this basal portion interesting in 
its mode of development, but also from its similarity to the sub- 
sequent leaves. In fact, as fig. 138 shows, it may be said that we 
have a compound structure formed of a leaf at the base, ter- 
minated by the cotyledon. 
If, indeed, this species stood alone, we might regard the 
resemblance as accidental; but we find a very similar growth in 
other allied species. 
In Clarkia pulchella (fig. 189) the cotyledons immediately 
after germination closely resemble those of Eucharidium grandi- 
forum (fig. 136). They are oblong-oval, entire, with a slightly 
Prominent colourless tooth at the apex of the midrib, sessile, 
and very shortly auricled at the base. Six days after germina- 
tion they are orbicular, shallowly emarginate, very shortly 
petiolate, and slightly cordate at the base. In a short time 
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