SUMMARY. 95 



SUMMARY. 



Hairs are protuberances developed from the epidermis of any part. 



Glandular hairs are those which secrete fluid-substances. 



Eglandular hairs are those which do not secrete any substances. 



Scaly haii-s are those which are flattened and do not secrete any sub- 

 stances. 



Normal hairs are those which are more or less filiform and do not secrete 

 any substances. 



Soot hairs are those normal ones which are developed on roots. 



Shoot hairs are those normal ones which are developed on stems or 



— -i^J-*®)*^"^ — 



