GLOSSARY 425 



Pollina'tion : the transfer of pollen from the anther to the stigma. Self- 

 pollination is transfer between parts in the same flower ; cross-pollination 

 is transfer between different flowers, or between flowers on different plants. 



Poryp (Lat. polypus, a polyp) : a simple actinozoan, as a sea anemone or a 

 single coral individual. 



Poste'rior (Lat. posterior, later) : nearer the last or tail end of an animal. 



Precip'itins : antibodies or precipitating substances formed in the blood as a 

 reaction to the introduction of certain foreign proteins. 



Probos'cis (Gr. pro, before ; hoskein, to feed) : a slender sucking tube found 

 in insects. 



Proglot'tids (Gr. pro, forward ; glotta, tongue) : reproductive body segments 

 of a tapeworm. 



Pro leg : an un jointed abdominal appendage of insect larvae. 



Protec'tive resemblance : the likeness of living organisms in color or form 

 to their immediate surroundings, thus securing protection from attack 

 of enemies. 



Pro'teins (Gr. protos, first) : nitrogenous compounds found in the bodies of 

 plants and animals; a class of nutrients composed of nitrogen, carbon, 

 hydrogen, and oxygen, together with other elements in some cases. 



Pro'toplasm (Gr. protos, first ; plasma, a thing formed) : the living substance 

 of plants and animals. 



Protozo'a (Gr. protos, first ; zoon, animal) : one-celled animals. 



Pseudopo'dium (Gr. pseudes, false ; pous, foot) : a projection of protoplasm 

 used for locomotion in protozoa. 



Pto'maine (Gr. ptoma, a corpse) : poisonous material probably the result of 

 decomposition of proteins. 



Pul'monary (Lat. pulmo, lung) : pertaining to the lungs. 



Pulvi'nus (Lat. pulvinus, cushion) : a special motor organ at the base of the 

 petiole of a leaf. 



Pu'pa (Lat. pupa, puppet) : the quiescent stage in insect development pre- 

 ceding the adult. 



Pylo'nis (Gr. pyloros, gatekeeper) : the opening of the stomach into the in- 

 testine. 



Q 



Quar'antine (Fr. quarante, forty, referring to 40 days quarantine against 

 plague in Venice and other Italian cities during the Middle Ages) : isola- 

 tion of the sick to prevent the spread of commxmicable disease. 



Re'flex : simplest type of nervous response. 



Regenera'tion (Lat. re, again ; generare, to beget) : the growing again of a 



part of an animal which has been lost. 

 Reproduc'tion : the process by which organisms produce offspring. In 



asexvul reproduction a new organism is formed by the separation of a 



