542 
APPENDIX. 
[B. 
In another part of his work * he describes and figures, in 
the early state of the Ovulum, two coats, of which the outer 
is the testa; the other, his “ middle membrane,” is evidently 
what I have termed nucleus, whose origin in the Ovulum of 
the Apricot he has distinctly represented and described. 
Malpighi, in 1675t, gives the same account of the early 
state of the Ovulum ; his “ secundinee externse” being the 
testa, and his chorion the nucleus. He has not, however, 
distinguished, though he appears to have seen, the foramen 
of Grew, from the fenestra and fenestella, and these, to 
which he assigns the same functions, are merely his terms 
for the hilum. 
In 1694, Camerarius, in his admirable essay on the 
sexes of plants J, proposes, as queries merely, various modes 
in which either the entire grains of pollen, or their particles 
after bursting, may be supposed to reach and act upon the 
unimpregnated Ovula, which he had himself carefully ob- 
served. With his usual candour, however, he acknowledges 
his obligation on this subject to Malpighi, to whose more 
detailed account of them he refers. 
Mr. Samuel Morland, in 1703 §, in extending Leeuwen- 
hoek's hypothesis of generation to plants, assumes the ex- 
istence of an aperture in the Ovulum, through which it is 
impregnated. It appears, indeed, that he had not actually 
observed this aperture before fecundation, but inferred its 
existence generally and at that period, from having, as 
he says, “ discovered in the seeds of beans, peas, and 
Phaseoli, just under one end of what we call the eye, a 
* Anat. of Plants, p. 210. tab. 80. 
t Anatome Plant, p. 75. et 80. 
% Rudolphi Jacohi Camerarii de sexu plantarwn epistola, 
p. 8. 46. et seq. 
§ Philosoph, Transact, vol. xxiii. n. 287. p. 1474. 
