11 



interstices are filled with air. Among these surf ace- wet ted 

 particles the root-haiis make their way, clinging tightly to 



Figure 5. 



Figure 5. Diagrammatic representation of the relations of the root-hair to air 

 and water in the soil. The angular bodies are earth -par tides sheathed with a 

 surface-film of water. Thf root-hair descending from the root has a similar water- 

 film upon it. Larger portions of water fill in the interstitial angles. The 

 numerous blank spaces, similarly film -en circled, are portions of air distributed 

 among the mass. (From Sachs). 



