Geology and Natural History. 59 
published by Sir William Hooker. We received and duly noticed 
the first two parts of the new issue. The third part, by som 
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Phyllacanthus Grisebachianus Hook. f, the plant of C. Wright’s 
Cuba collection named by Grisebach Catesbea phyllacantha. 
Brackenridgea Zanguebarica Oliver, a second species, so Ta 
confirming the genus. A. G. 
1. Structure of the Pistil in Primulaceew.—V an Tieghem, upon 
his first study of the ovary of Primula, &e., finding that the vas- 
cular bundles of the free central placenta were disposed in a circle 
in a homogeneous parenchyma, adopted the apparently prevalent 
view that this placenta belongs to the axis and not to the carpels, 
this arrangement being that characteristic of stems. But further 
and more scrutinizing observations show that this conclusion does 
not follow. Without known exception, the vascular and woody 
bundles of stems have their spiral vessels on their inner face, their 
liber or bast cells on the outer face, i. e., presented to the circum- 
ference of the stem. Now Van Tieghem finds that the bundles 
' the placenta of Primula and other plants of the same order (as 
e in Oaryophyllacew, &c.) present their liber-cells inward, 
ewis 
“ae Spiral vessels outward, contrary to the manner of vascular - 
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duce an accessory piece or appendage 
base, such as he yesuls of pape 8 of Oleander, the crown of 
the perianth of Narcissus, the stamens obaca, &e 
these the vascular bundles of the internal appendage or crown 
equally have their liber-cells facing toward the axis of the flower, 
cludes that, as these accessory pieces are appendages or rend 
fre ntral or basilar 
s e 
Placenta consists of internal appendages or deduplications of the 
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