TISSUES AND SIMPLE ORGANS. 



47 



but also caj)-st'gme?its for the '^ root-cap. ^^ These root-cap segments 

 are the result of partition-walls formed parallel to the distal surface of 

 the apical cell, as shown in Fig. 29. (In this branch of anatomy 



r 



BM-±i 



Fig. 26 I 



Fig. 38 c. Fig. 29. 



extensive researches have been made by Nageli, Sciiwendenee, and 

 Leitgeb.) Other types of root-growth will be considered later. 



