154 SECRETORr RESERVOIRS. 



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

 found scattered in the pith. 



Many, but not all Leguminosje 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 

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

 occurrence of tannin enumerated by Trdcul, we have to deal with secretory sacs •. 



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

 Du Tannin dans les Rosac^es, Ibid. p. 1035. — See also Sanio, Bern. Uber den Gerbstoff u. s. Verbrei- 

 tiing, &c. ; Botan. Zeitg. 1863, P- i?- — Wigand, Ibid. 1862, p. 121. 



