ORGANISM 



ORGANS 



TISSUES 



L- 



Photo: J. J. Ward. 



RASPING RIBBON OR FILE, BADLY CALLED THE 

 PALATE, IN THE MOUTH OF THE WHELK 



By means of this toothed flexible file the whelk can bore a hole 

 through the skin, or even through the shell, of an animal on which 

 it preys. 



CELLS 



PROTOPLASM 



A living creature or organism is 

 usually built up of organs, such as 

 heart and kidneys; the organs are 

 composed of tissues, like muscular 

 and nervous, glandular and con- 

 nective tissue; the tissues, e.g. a 

 piece of flesh, are built up of micro- 

 scopic unit-corpuscles or cells of 

 various kinds; and the cells consist 

 largely of living matter or proto- 

 plasm. 



J 



JOHN GOODSIR, 1814-1867, PROFESSOR OF ANATOMY 

 IN THE UNIVERSITY OF EDINBURGH 



A remarkable pioneer who had an important share, along 

 with Schwann, Schleiden, and Virchow, in establishing the Cell- 

 Theory one of the foundation-stones of Biology. 



