- 301 - 



and deterraining the weight of the tannic principle obtained by 

 evaporating the filtered alcoholic solution to perfect dry ness. 



„The cultivation of the black wattle is extremely easy, being eft'ected 

 by sowing either broadcast or in rows. Seeds can be obtained in 

 Melbourne at about 5 sh. per Ib., which contains from 30,000 to 50,000 

 grains. They are known to retain their vitality for several years. 

 Seeds should be soaked in warm water before sowing. Any bare, 

 barren, unutilised place might most remuneratively be sown with 

 this wattle-^cac/ff ; the return would be in for five to ten years. 

 Fullgrown trees, which supply also the best quality, yield as much as 

 1 cwt of bark. 1 have taken the liberty to extract almost the entire 

 article published by Baron von Mueller, in his exceedingly valuable 

 work „Select Extra-Tropical Plants", thinking it was certain to 

 prove most usefull to persons experimenting in India with the 

 cultivation of the wattle or with its most valuable tanning-bark. 

 The variety mollis {Acacia mollisima, Willd.) is the most plentiful 

 ferm in Victoria, and this is also admitted to be the most powerful 

 tanning agent. It grows rapidly, and in addition to the bark and 

 gum which it aftords the timber is much valued, chiefly as fuel". 



Aldus Watt. 



§ 7. Rhizophoren-bast. 



Hetgeen in den laatsten tijd omtrent de waarde van mangrove- 

 bast als looimiddel bekend is geworden vinden wij uitnemend gere- 

 fereerd in de navolgende in Tei/smannia reeds verschenen mede- 

 deelingen van Dr. M. Greshoff en Dr. P. van Romburgh. 



Die referaten volgen hier: 



Looistof in Rhizophoren i). 



„In zijne monographie der kustvegetatie van den Indischen Archi- 

 pel wijst Dr. Karsten op het buitengewoon hoog tanninegehalte, 

 dat de planten der strandmoerassen kenmerkt. De plantendeelen 

 vinden in hunne looistof waarschijnlijk eene bescherming tegen het 

 verrotten, waartoe zij bij de ongunstige omstandigheden van hunne 

 groeiplaats lichtelijk zouden komen. Konden de basten der Bhi- 

 zophoren met voordeel in het groot ingezameld, en als looimateriaal 

 aan de markt gebracht worden, dan was het middel gevonden, de 



1) Teysmannia, II, 1891, blz. 511, 



