Organs and Classification of Animals. f 



wooden tray lined with sheet lead for the purpose, while 

 it often facilitates dissection to have a thin sheet of cork 

 weighted with lead, so as to retain its position at the 

 bottom of the fluid upon which the various parts may 

 be pinned down. To preserve animal organs the 

 best materials are, spirits of wine, or a weak (2 per 

 cent.) solution of bichromate of potassium. 



The study of the forms, nature and relations of 

 organs to each other and to the organism in general, 



FIG. 



Common orange Star-fish (Astropecten aurantiacus). 



and the laws deduced therefrom is known as Morpho- 

 logy ; the study of the uses of parts is called Physiology. 



