118 NOTES ON NKMAroiMIVroN CKASSITM PKMl ALLOW. 



ty])ical CcUnloxjiloit st nicdirc, as dctcrmiiK'd by tlic (Icvt'lt.pnu'iit in I he 

 iiilcrcclliilar spaces of Nciy lar.uc crystals or small ciystals wliicli ai-- 

 raii^i'c t lu'iiisclvos in yronps of correspond in, i;' size. 



(<•) (_!onii)letc coiiN'crsion ol'all the organic structure, wliicli is now re 

 placod by tlie typical (V//iJ(>.n//ow structure. Here the tilanienls of the 

 . inedulhi are broken up both transversely and longitudinally in sucdi a 

 way that the resulting (k-Uuloxylon cells form long series occu|)ying the 

 intercellular si)a(!es and having the aspect of \ermicular tilaments 

 similar in position to those of the medulla, but ha\'ing a considerably 

 greater diaimeter. between these three juincii)al conditions all degrees 

 of transition are to b<' noted. 



KXl'LAiNA'PlON ol' I'LATl'.S. 



I'l.AlK W. 



Fiji'. 1. 8ei'ti(tu iVttin 1\ ]«' spt'ciuKMidr r* //i//((.r///()/) /u/i/ki r(n»(, sliowinj;- ('liariicf crist ii" 



stnu'tiire. X l">t. 

 Fifj. 2. Scctitm of Svmatophjiton Iaujuu'i, sliowinji' tyi»i(;il CvlUtloxyloH stnutiuf. The 



saino preparation t'xliiltitcd typical Xcmntopliiiion ^Uwvtww. x 1")1. 



I'l.ArK \VI. 



Fig'. I>. .Section o( XcnKilcplinltni (/((.vx/nk, sliowini;' l.'irnc cells ol' medulla, iiitercelliilai' 



lilaiueiits, and Jill (ipeii ;u'ea. X IT)!. 

 I*"ii;. 1. Longitudinal section of the type spociiiicii ol' ('illiilo.ii/loii jiriiiKirinii I'ldiii 



I'rof. IvnowUdii. showing the (lisi»ositioii of tho crystals to confonii to the ]iosi- 



tion of the tubular ecllsof llie original strii(^tur«\ X 50. 



l'i,.\ii. .Wll. 



1 14(1 

 Fig. r». 'rransverse-aectionofr(7////(»,ri//()// ,.^ , showing characteristic structure, hut 



( ho carbonaceous uial Icr xcry iiiucli massed. Also showing nMunants ot' occa- 

 sional cells of the original structure. X 100. 

 !• ig. 0. Transvoi'so section from tlu^ sanu^ slidi^ as the preceding, showing normal 

 structure <d' the huge t iihiilar cells, lint replacemeni ol'Ihe intercellular lila- 



mciits by line crystals. .Vlso siiowing an open are.a. ..'. X 100. 



I'l.Ari: Will. 



Fig. 7. Transverse section from the samo slide as the two preceding, showing con- 

 version of tiie normal structure into Cclliilo.nihtii structure. ..^, X 100. 



Fig. 8. Longitudinal seel ion, showing I he tendency of tile crystals ti> form along lines 

 eonfornnibly (o the original striictuic. and thus essentially the same as in Fig. 4. 



''^ X =-.0. 



