279 



lo all aulhois lliev have nolliini^ to do wilh Ihe formalion of lissue 

 and iievcr f^ive rise lo iu'\v cells. Theie is, Ihus, no reason lo 

 call Iheni »inilials> or »apical cells». 



The analoniy of Ihe growing region is illuslraled in lig. 1 a'; Ihe 

 slruclure is lilamenlous, the outer sliorl cells gradually forming a 

 pseudopaienchymalic lissue; comp. also Hoe, lig. 19. Many of Ihe 

 end cells are prolongcd inlo hairs with hasal gioNvlh and covering 

 Ihe whole apex. Some of Iheir lower cells niay heconie dislinclly 



Fig. 1 a. Sectiou throufjli part of meri.stem, X 360. b, Section throufjh yoiiug 

 corte.v, X 3130. c. Section through old cortex, X 360 



moniliform; Ihey have chloroplasls while Ihe lemainder of Ihe hairs 

 consisls of very long, cylindrical, almost hyaline cells. Mitchell 

 and Whitting's fignres only show short hairs \vi!h Ihe walls bulging 

 unilalerall}', the upper part probably having been ciil or olherwise 

 losl. The hairs are of very short duration, and a little below the 

 apex no Irace of theni is left. The slruclure described by these 

 authors is not the young but the mature, Nvith closely packed 



* All fignres draw u at double the enlargement indicated and reduced to balf size. 



