~~) “74 . “a » hd t,t a Te bs - AF Tg ee as f 4 Fe 
‘a , . > - : ' - 
Soh Ss ; tne Qe s Ay . . y " vr.) ~ , 
4 Dshn PN Qieee an (f poo - Jy 7 5 o!) - j ra ; y ‘ 
eel ae A : . ~ 
gum Passages, as in Cactacez, Cycadeze, Amygdalee, &c.; otl- 
glands, inthe leaves of Hypericum perforatum, species of Citrus, 
Fic. 78.—Mode of formation of resin-passages ; J. transverse section through a termi- 
nal shoot of A dzes excelsa in process of development ; in the cortex the small group 
of cells HA containing starch-grains and in the act of division has separated from 
the rest of the cortical cells p which contain chlorophyll ; ug the first origin of ate 
resin-passage (x tooo). II. The same from a part more deeply imbedded ; 
the young wide resin-passage Hg the cells which contain resin form only a hele 
layer, and contain, in addition to fine- grained starch, small drops of a volatile 
= (x 800.) 
a &e. : ; camphor-glands ; and resin- stands (Fi ig. 80). The term 
-honey-glands or nectar ies, finally, is given to any part of a 
T. he Cell as a Member of a Group. cep Th ge 
