SCHIZOGENIC PASSAGES. 261 
these depositories in the form of small, strongly refracting 
drops, which are more frequently yellowish or brownish than: 
colorless, and are clearly miscible with alcohol, or at least with 
absolute alcohol, ether or benzol, and with fixed or ‘volatile 
oils. 
A mixture of gum, resin, and volatile oils (gum-resin), as in 
asafetida, galbanum, and ammoniacum, or even gum or muci- 
lage alone (Cycadeex),’ is also found in schizogenic secretion- 
receptacles. 
However, should any of the material occurring in cells or in 
Fie. 185,—Longitudinal section through the coniine layer, t, of Fig. 184, The letters 
have the same signification as in Fig. 184. 
intercellular spaces be found to be indifferent towards the above 
solvents, it does not necessarily follow that resin is absent, since 
the older lumps of resin dissolve only with difficulty. 
The resins are colored red by tincture of alkanet. The 
reagent of Unverdorben and Franchimont (an aqueous solution 
of acetate of copper) colors the drops of resin, after several 
days’ maceration in the liquid, emerald-green. 
The resins are not, however, confined to these receptacles, as 
1G, Kraus, in Pringsheim’s Jahrb, f. wissensch. Botan., iv., p. 305, 
Plates xxi. and xxiii. 
