250 PLANT ANATOMY. 
dilute alkalies and acids, but are dissolved by chloroform and 
carbon bisulphide. :. 
With the latex-tubes which are formed through solution of 
the intervening cell-walls are connected the receptacles for 
resin and balsam, which are produced in a lysigenic manner 
(see pages 170 and 248). 
These appear as roundish spaces or cavities, filled with their 
contents (formerly termed ‘‘interior glands”), and are pro- 
duced in such a manner that those cells which occupy the 
place of the subsequent receptacle become filled at an early 
period with the respective secretion ; afterwards the membrane 
of these cells containing the secretion disappear (Fig. 168, com- 
Fig. 168.—Formation of an oil gland of Dictamnus Fraxinella; at the left is repre- 
sented, below the epidermis, a group of small cells which become filled with drops of 
oil, while the cells are in process of dissolution ; at the right, most of these cells have 
already become dissolved, and in their place is produced a lysigenic intercellular space 
containing a secretion (Rauter). 
pare also the previous remarks in connection with the cell- 
membrane). ‘These receptacles are not, like the resin-canals 
(which will be considered directly), bordered by a circle of se- 
creting cells; the cells inclosing them are not essentially dis- 
tinguished from the tissue of their surroundings. With these 
may be classed the oil receptacles of the Rutacew? (Ptelea, 
™Compare Rauter, ‘‘ Zur Entwickelungsgeschichte einiger Trichomge- 
bilde.” Sitzungsber. d. Wiener Akad., 1872, and Von Hohnel, ‘‘ Anatomi-. 
sche Untersuchungen iiber einige Secretionsorgane der Pflanzen.” 
Wiener Akademie, November, 1881. 
