154 SECRETORy REHERVOIRS. 



the pith, just opposite each of the vascular bundles : besides these, short sacs are 

 found scattered in the pith. 



INIany, but not all Leguminosa? are rich in tannin, which is distributed in the 

 tissues in various ways, but in a very constant manner in single species, genera, &c., 

 often without doubt in tissues that do not correspond. The same holds for the 

 Rosiflora?. It remains to be investigated whether also, in many of the cases of the 

 occurrence of tannin enumerated by Trecul. we have to deal with secretory sacs\ 



' Compare Trecul, Du Tannin dans les Le'giimineuscs ; Comptes Rendus, torn. LX. p. 225. — 

 Du Tannin dans les Rosacees, Ibid^ p. 1035. — Sec also Sanio, Bern, iiher den Gerbstoff u. s. Verbrei- 

 tiuig, &c. ; Botan. Zulg. U63, p. 17. — ^Vigand, Ibid. 1S62, p. 121. 



