THE METAZOA 



throw out invisible germinal particles to- 

 wards the nearest healthy cells at the edge 

 of the sore, stimulating them to aid in 

 forming a bridge across to the grafts. In 

 time the open sore is thus covered with 

 good skin, whose cells at once quit 

 multiplying so soon as they join healthy 

 skin cells. 



But now among apparently the most 

 well behaved metazoic cells there appears, 

 no one yet knows why or how, a pure 

 rebel against life's beneficent law of mu- 

 tual dependence and co-operation. This 

 rebel will grow and multiply just where it 

 pleases without the least consideration for 

 the traditional claims of others. Thus a 

 cell from the mucous membrane of the 

 lower intestine leaves that place and finds 

 its way by the blood stream till it lodges in 

 the brain, and then grows where it has no 

 more business to be than a chimney sweep 

 has to be ensconced in a lady's boudoir. 

 115 



