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REPORT ON THE CULTIVATION OF CHINCHONA IN BENGAL. 155
passed upwards and outwards through the reraaining structure to the
leaves. Into this hirge central mould and the small radiating tubes the
amorphous material was pressed, until it completely filled them. Sub-
sequently the cylinder of elongated cells was converted into coal, form-
ing a thin film, which surrounds and separates every cast of the cavity
of the vascular bundle. The pressure to which the stem was subjected
has compressed it, and also pressed the long processes against it.
The upper portion of the specimen figured would be referred to
Knorria lotigifolia, while the lower portions represent the appearance
of the stems named K. imbricata. Professor Schimper has given an ex-
tensive series of illustrations of these stems in his ' I^e Terrain de
Transition des Vosges,' plates xiii. to xx. He considers the subcortical
' cushions ' of the leaves to have been produced between the wood and
the bark, but if the fossil belongs to Lepidodenclrecc, where he, as I be-
lieve, correctly places it, this is an uncertain locality. For if we con-
sider the cellular structure external to the wood cylinder as cortex, then
it is certain that there is a very much greater diameter in the stems of
Knorria than is known to exist in any Lepidodendron. And if on the
other hand the cortex refers to the external layer of thickened and in-
durated cells, this was too thin a layer to permit the formation of such
long processes. The interpretation supplied by the specimen figured
explains the peculiarities of the fossil, and also shows that it can no
more be retained as a separate genus than Sternbergia.
Explanation of Plate XCIII.
Specimen of Knorria, from the Edinburgh Coal-measm'cs, from the cabinet
of Charles Peach, Esq., Edinburgh.
EEPORT ON THE CULTIVATION OF CHINCHONA IN
BENGAL FOR THE YEAR 1867-68.
By Thomas Ahderson, M.D.,
Superintendent, Botanical Gardens, and in charge of Chinchona Cultivation
in Bengal.
[Read befoi-e the Botanical Society of Edinburgli.]
The cultivation of the Chinchonas has been most successfully carried
on during the year. The open-air cultivation has been greatly ex-
tended, and now consists of four times the amount of plants reported
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