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40 INTRODUCTION TO BOTANY.
tubercles resembling these oi-gans, althougli they do not
really secrete any liquid.
1. Cellular glands, GlandulcB celhdares, Glnndulce excretoricB.
Formed of cellular texture without any communi-
cation with vessels. Nectaries of flowers.
2. Vascular glands, Glandulae vascidares, Gl. secreforit,
Gl. urceolares. Formed of cellular texture, traversed by
vessels. Ovary of the cobaea. Tubercles on the petiole of
drupaceee.
Hairs, Pi//, Villi. Small, tender, hairlike appendages,
composed of one or more cells projecting from the texture
of the plant.
1. Glanduliferous hairs. Pill glanduliferi. Supportingglands
on their tip. Cicer arietinum, Croton penicillatum.
2. Excretory hairs, Pili excretorii. Placed on glands
serving as excretory ducts. Urtica urens, Malpighia urens.
3. Pili lymphatici. Not connected with any gland; seem
mere organs of evaporation.
Organic parts. Paries organicxE, Organa composiia, Organa.
Parts composed of the former; and generally visible.
1. Organs of vegetation, Organa nutritiva. Necessary to
the growth and life of the individual, as the root, stem,
bud, and leaf.
2. Organs of reproduction, Organa reproductiva. Necessary
for the reproduction of the individual, or life of
the species, as the flower, fruit, seeds, buds, &(*.
Organs of fructification, Organa Jrvclijicationis. Organs
of reproduction by means of fecundation ; as the flower,
fruit, seed.
Organs of germination, Organa germinationis. Organs
as germens, gongyli,
of reproduction without fecundation ;
propagines, and conidia.
3. Accessory organs, Organa accessoria. Not found in
all plants, seated upon the other organs, as thorns, prickles,
cirri.
3. Contained Juices.
Sap, Alimonia, Humor, Lijtnpha. A watery liquid newly
absorbed, and not yet much changed by vegetation.
Caynhium. The mucilaginous juice, already changed,
traversing the membranous texture, from which the new
parts are formed; is perhaps a liquid gum.
Juice, Succus. Any liquid that can be pressed out of a
plant : they vary in different plants.