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GLOSSARY OF IMPORTANT TERMS 



Hypocotyl (hi'po kot'il) : the part of 

 the developing embryo which forms 

 the root and the lower part of the 

 stem. 



Imbibition (lm'bl bish'&n) : a form of 

 diffusion that results in the swelling 

 of material taking in a fluid. 



Immunity (1 mu'ni ti) : the successful 

 resistance of an organism to infec- 

 tions from microorganisms. 



Imperfect flowers : flowers having 

 only one kind of essential organs, 

 either stamens or pistils. 



Incubation (In'ku ba'shwn) period : the 

 time the germs of a disease enter 

 the body until the symptoms of the 

 disease appear. 



Indehiscent (In'de his'ent) : not open- 

 ing at maturity along a definite line 

 to discharge contents. 



Infectious (in fek'shws) : caused by 

 disease-producing organisms, or 

 germs. 



Inheritance : that which is passed on 

 by heredity. 



Insecta : class of insects. 



Inspiration : the act of taking air into 

 the lungs. 



Instinct (m'stinkt) : a tendency to 

 perform an act which is performed 

 for the first time without being 

 learned. 



Insulin (In'sti lin) : a hormone pro- 

 duced in " Islands of Langerhans " 

 in the pancreas ; remedy for dia- 

 betes. 



Intestine (in tes'tm) : the food tube in 

 vertebrates from the pyloric end of 

 the stomach to the anus. It is 

 divided into the small and the large 

 intestine. 



Invertebrate : an animal not having a 

 backbone. 



Iris : the colored portion of the eye, 

 having the pupil in the center. 



Kidneys : glands which secrete urine. 

 Kinetic (ki net'Ik) : energy employed 

 in producing motion. 



Lacteal (lak'te al) : lymph vessel in 



the villi. 

 Larva (lar'vri) : a young stage in the 



development of some forms of ani- 



mals, which becomes self-sustaining 

 but which does not have the char- 

 acteristics of the adult. 



Latent (la'tent) : lying dormant but 

 capable of development. 



Legume (leg'tim) : plant which bears 

 seeds in pods — pea, bean, and the 

 like ; also the fruit or seed of such 

 plants. 



Lenticel (len'tl sel) : a breathing hole 

 in the bark of a tree. 



Lepidoptera (lep'i dop'ter d) : order of 

 insects to which moths and butter- 

 flies (scale wings) belong. 



Leucocyte (lu'ko sit) : a white blood 

 corpuscle which destroys foreign 

 organisms, as bacteria. 



Lichen : a composite organism con- 

 sisting of a fungus and an alga. 



Ligament (lig'a ment) : a band of con- 

 nective tissue binding one bone to 

 another. 



Lipase (lip'as) : the digestive enzyme 

 that splits fats into fatty acids and 

 glycerol. 



Liver (liVer) : a digestive gland which 

 secretes bile. 



Lymph (limf ) : plasma and colorless 

 corpuscles outside of the blood 

 vessels. 



Lysins (li'sinz) : antibodies which have 

 power to dissolve bacteria in the 

 blood. 



Macronucleus (mak'ro nu'kle us) : the 

 large nucleus of a Paramecium, as 

 opposed to the micronucleus, or 

 small nucleus. 



Maggot : the larva of an insect. 



Mammary (mam'd rl) glands: milk- 

 secreting glands found in mammals. 



Mandible (man'dl b'l) : in insects, a 

 hard cutting jaw. 



Mantle : the soft outer fold of skin in 

 mollusks which secretes the outer 

 sheU. 



Maxilla (mak su'd) : an appendage 

 near the mouth of arthropods, modi- 

 fied in insects to form an organ for 

 getting food. 



Maxilliped (mak sill pSd) : an appen- 

 dage next to the maxilla in arthro- 

 pods. Foot jaw. 



Medulla oblongata (medul'd Sb'16n- 

 ga'tri) : the portion of the brain 



