SCHIZOGENIC PASSAGES. 259 
etc., also supports this view. It has, however, recently been 
shown that the oil-tubes are produced in the same manner as 
the resin-receptacles of roots,’ and are thus of schizogenic 
origin. 
As an exception, in Fructus Conti oil-tubes* are not found 
at the period of ripening (as has previously been already men-. 
tioned), but rather a connected layer of cells (Fig. 184), im 
which is located the volatile oil and coniine. When observed: 
Fic. 183.—Longitudinal section{through an oil-passage from Fructus Foeniculi, with 
transverse walls; s, dark-brown efflorescing cork-like tissue; a, albumen of the seed. 
on a longitudinal section (Fig. 185), this layer represents the 
cells superposed in a compartment-like form; if their transverse 
1 Lange, ‘“‘ Uber die Entwickelung der Oelbehalter bei den Umbelli- 
feren,” K6nigsberg, 1884. Dissertation.—Compare also E. Bartsch, 
‘‘ Beitrage zur Anatomie und Entwickelungsgeschichte der Umbelli- 
ferenfriichte.” Inaugural Dissertation, Breslau, 1882. 
2 In young ovaries they are present as an initial formation, but do not 
become developed. 
