X 
SECTIONS OF BARK. 
PLATE III. 
Fig. 1. Third crop of renewed bark of C. succirubra . — 
a , the suberous layer ; b, deposit of resin in the cellular 
tissue about to change into cork ; m, abnormal concre- 
tions ; i and j, abundant deposit of soluble salts of 
quinine ; c, prolongation of medullary ray ; k, crystals 
of a kinovate ; /, liber-fibres ; n, inner surface with trace 
of cambium. X 50 diameters. 
Fig. 2. Lax cellular tissue from the above, full of 
alkaloid. X 100 diameters. 
Fig. 3. Globular concretion of the above alkaloids 
without cellular tissue ; j, crystalline masses ; ?, trans- 
parent globes. X 200 diameters. 
Fig. 4. Third crop of renewed baric , and its junction with 
the old bark, drawing of complete section ; a, suberous 
coat ; m, medullary rays contorted ; /, sharp line of de- 
marcation between liber and cellular tissue ; A, liber- 
fibres ; a*, abnormal formation, probably marking the divi- 
sion between the old and the new bark. X 10 diameters. 
Fig. 5. Unrenewed end of C. officinalis quill, 5 years 
old; a, the suberous layer ; b , changing into cork ; m, 
ordinary cellular tissue ; /, liber-fibre ; ) , prolonged 
medullary ray ; h , traces of the cambium. X 50 dia- 
meters. 
Fig. 6. Renewed end of quill of C. officinalis , nearly 
a year and a half old ; a , the suberous layer ; b , deposit 
of resin in cellular tissue changing into cork; c, lax 
cellular tissue ; i and j, the same full of alkaloid ; 
/, congeries of liber-fibres ; c , prolonged medullary ray ; 
A, remains of cambium layer. X 50 diameters. 
Fig. 7. Renewed bark of third crop , with spiral tissue ; 
ct , the suberous layer ; b , pale cellular tissue ; n , spiral 
tissue longitudinally placed ; o , bunches of spiral tissue. 
X 20 diameters. 
Fig. 8. Portions of spirals from the above bark; 
a , partially unwound, showing the angularity of the 
fibre ; b , annuli; c , scalariform-like tissue ; d , joined as 
spirals usually do ; e , portion somewhat netted, and with 
the abrupt junction characteristic of reticular tissue. 
X 350 diameters. 
