68 
VI. LAGATIJADA (1izanp-corouren). 
Tuc species to which this bark belongs is not known, and 
M. Ruiz has not mentioned it in his Quinologia. Yet he has 
given us specimens* by which to recognise it, and he regards it, 
_ with those who trade in it, as one of the species peculiar to the 
province of Loxa. We have compared it with the preceding spe- 
cies, and have found that the Yellow is that with which it has 
most affinity by the fineness of its epidermis, its size, its thick- 
ness, and its colour, as well as its bitterness and smell; but 
the internal surface is of a less lively colour, and has less of the 
velvet tact; its fracture is entirely ligneous. If this bark is to 
form a separate species, it will be easily distinguished from the 
other species of Loxa, and particularly from the Yellow, by this 
striking characteristic, and by the colour of its epidermis. In 
the common Loxa which some draggists have oe us, we have 
found a considerable quantity of this bark.+ : 
Such are the Quinguinas which are sold singly or mixed, under. 
ae name of Lona, and which are at the same time the most es- 
wisties : but the preat diaeteace observable pe thickness of the epidermis of these two barks 
must render the identity of the species very doubtful. It appears that the botanists of Peru - 
now agree in ee two harks as ig oe Bo Ho diGerest species ; and M. Ruiz 
is of the same opinion, 
* When we undertook to describe the Quivquina of commerce, we were aware of the 
difficulty, or rather the impossibility, of establishing the distinetive characters of the species 
according to their barks, M. Ruiz, to whom we communicated our project, has had the 
goodness to give us samples of all the barks which in his opinion belong to the species of 
the genus Cinchona, with the names given ‘by the natives to each species, and those of com- 
merce, as well as his opinion on their febrifuge qualiti ies, We have also consulted his Quino~ 
‘Yogia for all the species of which this learned botanist has given a description. 3 
“+ The chests sent to us from America, instead. of a single st ies ; of Quinguina which 
each ought to contain, are filled with two, three, and often a greater number of different 
barks. This abuse has augmented in proportion as good barks have tnisetete and as dis. 
_eoveries have been made of new or pretended new species, 
