Preface 



that at last the very form of a flower may be 

 cast in the mould of its winged ally. A word is 

 also spoken regarding the singular relations of 

 late detected between the world of vegetation 

 and minute forms once deemed parasitic. The 

 pea and its kindred harbor on their rootlets cer- 

 tain tiny lodgers ; the tenants pay a liberal rent 

 in the form of nitrogen compounds, a striking 

 interlacement of interests ! 



^George Iles. 



viu 



