----- 



KFFECT OF PARASITIC Kl'Mil oN CELL-CONTENTS. '.'<> 



cellulose and a granulose part, Haiti*,' describes tin- proce thus 

 < Fig. 11). The mycelium "I' -peeies like /V//^//-//.s igniarius 

 gives off some ferment which dissolves the starch-grains, l>y cor- 

 roding them from the outside inwards, su as to t'ui-iu holes and 

 canals similar to those in 

 -tarch-grains in process of 

 dissolution in the cells of a 

 sprouting potato. In other-. 

 e.g. TI"I< jilii'i-n perdix, the 

 -ran u lose is first dissolved 

 from without inwards, so that 

 Hnally only the starch-cellulose 

 remains, occupying a region Fl , ; n ._ starL . h K ,, lhls fl . OI11 th , ,, lk , , 



towards the OUter l)'irtS of cess of dissolution by ferments, a, of 2Vie& 



1 perdue; '/, of /'<//<//>;.< tutp 



the grain as a kind of husk . in ;m,i >. ti,,-i,,.ii. ,.-.-,-, 



is ~ho\vn liy slKiilini,'. (After K. Hartlg.) 



which is in time gradually 



u~cd up. In I'uliipni-ii* xnlj>]ini: //.s the operation is reversed; 

 the starch-cellulose appears to lie dissolved out first, leaving 

 a residue of granuln-,-. These observations were based mi 

 the assumption that the starch-grain consisted of a uianu- 

 lose portion which turned blue with iodine, and a starch- 

 c.-llulose portion which became yellow; or again, on treating 

 the starch-grains with dilute acids the granulose wa> dissolved, 

 while the cellulose remained in the form of a skeleton. 

 Although more recent investigations have shown that the 

 cellulose-skeleton results from the action of the acids, and that 

 i hU view of the constitution of the starch-grain was not <|iiite 

 correct, yet Harti^'s oli-er\ at \i\- prove that the various fmiiius- 

 Icrnients have each their own action on starch-brains: his 

 results are also supported by other fads. 



<Mher I'un-i besides 1'olyporeae utili/.e the starch of their 

 hoSt-plantS, thus /'/>//Ay//,//,u/w in leaves of the potato. 



The formation of calcium o.xalatc is influenced by action of 

 parasite-. l-'rom \\'akkcr's synopsis of the jihenomena of hyp.-i- 

 trophy, we tin, | that calcium oxalale normally present in cry-tal- 



- in leaves and flowers of l!lu< n< n n^ /'/"///////", i- \\anlin- in 

 p;irt< detoiined 1,\- A, ,-'nl ',,/ 1,1 rli >i m n i : crystal-sacs arc ' 



abundant in diseased stems ilian in healthy: the calcium o\al.ite 



III '_'.llls of I-' ,nl, t^',,1 nil, i js not ]UV-e|it ill crVst;, 1 ;i- ill the 



non-deformed ..r-ans, but as ill-defined solitary crystals of limited 



