December 29, 1893.] 



SCIENCE. 



355 



USUAL ILLUSTRATIONS OF ROOT HAIRS. 



—When aperture hap- 

 pens to be in positi' n 

 so that both lips are 

 just in focus. 



Appearance— When both lips are not' 

 in focus, or the aper- 

 ture is directed away 

 from view. 



OAT HAIRS MORE MAGNIFIED. 



Turnip Root Hair— Long, thready, 

 soon b e c o m es 

 twisted. Hole 

 exceedingly mi- 

 nute and diffi- 

 cult to find. 



Barley. 

 Potato. 



TIP OF OAT ROOTLET WITH ROOT HAIRS (much magnified.) 



USUAL FORMS OF HAIRS. 



