HEARTWOOD OF CKVTOMKRIA JAPONICA 851 



color reactions all agree with those of catechol. The authors also de- 

 termined by microscopical examination of "Svigi" that newly devel- 

 oped woody cells showed the so-called coniferin reactions while they 

 were not able to be stained by phloroglucin and hydrochloric acid. The 

 above ■ observations may lend support to H. Kimura's explanation of 

 the derivation of "particular substance" from coniferin. 



The "particular substance" is found not only in true heartwood of 

 "Sugi" but also in its false heartwood. Considerably before marked 

 evidence of the normal heartwood of individual trees is visible, it may 

 occur even in those reddish brown spots caused by wounds or sporadic 

 staining as false heartwood. Slips, by which this tree is widely 

 propagated, show the patliological formation of heartwood in the cut 

 ends the year after their insertion. In these cases, the false heart- 

 v^^oods are more or less different from normal heartwoods in tint 

 because the causes responsible for the production of the "particular 

 substance" exactly comply with those for the conversion of tint, as is 

 explained later. 



As several sets of facts help to explain the view that the "particular 

 substance" is merely an accessory of the principal coloring matter of 

 the heartwood, it seems possible that the causes responsible for the 

 production of heartwood in general must also be responsible for the 

 production of this substance. 



Although the formation of heartwood, normal and false, has been the 

 subject of considerable discussion among many investigators '^ an exact 



'■'v. .A.lten. W-rsuche und I-",rtahrnngen mit Rothbuchenholz. Forst — u. 

 Jagdztg., 1895. 



Frank, H. Ueber die Gunimibildung im Holze und deren physiologischen 

 Bedeutung. Ber. d. deut. Bot. Ges., 1884, p. 32.3. 



Gaunersdorfer, J. Beitrage ziir Kenntniss der Eigenschaften und Entstehung 

 des Kernholzes. Sitsungsber. d. k. Akad. d. Wiss. Wien, Bd. 7.5, Abt. 1. 18S:>, p. 28. 



Hartig, R. u. R. Weber. Das Holz der Rothbuche. 1888. 



Hartig, Th. .A.llg. Forst— u. Jagdztg.. 185?! p. 283. 



Herrmann, E. Ueber die Kernbildung bei der Rothbuche. Zeits. f. Forst — u. 

 Jagdw.. 1902. pp. 596-G17. 



Kraus, E. Ueber Ausscheidung der schutzholzbildenden Substanz an.Wund- 

 flachen. Ber. d. deut. Bot. Ges., 1S84. 



Lindroth, Beitrage zur Kenntniss der Zersetzungserscheinungen des Birken- 

 holzes. Xaturw. Zeits. f. Forst — u. Landw.. 1904. p. 393. 



Miinch, E. Die Blaufaule des Xadelholzes. Xaturw. Zeits. f. Forst — u. 

 Landw., !9()S. p. 44. 



Miinch, E. Untersuchungen iiber Immunitat und Krankheitsempfanglichkeit 

 der Holzpflanzen. NatU'-w. Zeits. f. Forst — u. Landw., 1909. p. 133, p. 158. 



Miinch E. Ueber krankhafte Kernbildung. Xaturw. Zeits. f. Forst — u. 

 Landw., 1910. pp. 533-547, pp. 553-509. 



Ohnacker. Zer Ruchcn?chwellenfrage. Allg. Forst — u. Jagdztg., 1889. p. 124. 



