XXXIV 



Organs concerned in Nutrition. 

 i. 



RESERVE STORES OF FOOD, AND CALORIFIC 



MATTER (not for Embryo). 

 Plants. 



Examples. As Starch in Stem : Potato, Sago-palm, &c. 

 Inulin : Dahlia. 

 Sugar : Beetroot, &c. 



Animals. 



Examples. As Oil : Fatty bodies of Amphibia, Eeptilia. 



Glycogen : in mantle-lobes of Mollusea, and Liver. 



J. 



ORGANS FOR DIRECT ABSORPTION AND 



PREPARATION OF FOOD. 

 Plants. 



Most plants absorb their food iu a fluid or gaseous form. By 

 their roots (also used for fixation) they chiefly absorb water 

 holding in solution mineral salts and compounds of nitrogen. 

 By their leaves, or, in some cases, by their stems, the gases. 



Bacteria iu the soil greatly increase the vigour of plants, by 

 changes they produce in the organic constituents of the humus. 



Examples of Roots arranged taxonomically. 



Animals. 



Many parasites that live with the whole or a part of their 

 bodies bathed by the nutrient juices of their hosts are nourished 

 by the direct absorption of such juices, and possess no digestive 

 or circulatory apparatus. 



Examples. Infusoria : Opalina. 



Gregarinidee : Gregarina, &c. 

 Cestoidea Tsenia. 

 Crustacea Sacculina. 



