species; of these the _album_ here figured, (whose name is
derived from the whiteness of its petals, and with which the nectary
must not be confounded) is by far the most magnificent; indeed there are
few flowers which to such singularity of structure add such elegance and
beauty: it grows spontaneously in various parts of North-America, and
chiefly in the woods; was introduced to the royal garden at Kew, by Mr.
WILLIAM YOUNG about the year 1770, but was known to Mr. MILLER, and
cultivated by him at Chelsea long before that period; this intelligent
and truly practical author informs us, that all the sorts of Cypripedium
are with difficulty preserved and propagated in gardens; he recommends
them to be planted in a loamy soil, and in a situation where they may
have the morning sun only; they must, he observes, for the above
reasons, be procured from the places where they naturally grow; the
roots should be seldom removed, for transplanting them prevents their
flowering, which usually takes place in June.

A greater proof of the difficulty of increasing these plants need not be
adduced than their present scarcity, though vast numbers have been
imported, how few can boast of possessing them, or of preserving them
for any length of time; careful management in their cultivation will
doubtless go far, but peculiarity of soil and situation would appear to
be of greater importance: it is well known that certain plants thrive in
certain districts only, the double yellow rose, for instance, barely
exists near London, yet this plant I have seen growing most luxuriantly,
and producing a profusion of bloom, in the late Mr. MASON'S garden,
Cheshunt, Herts, and in which various Orchis's also acquired nearly
twice their usual size,--enviable spot!

INDEX.

In which the Latin Names of the Plants contained in the _Sixth Volume_
are alphabetically arranged.

_Pl._

200 Antirrhinum sparteum.

207 ---- alpinum.

199 Aster alpinus.

210 Celsia linearis.

195 Cheiranthus mutabilis.

181 Colutea frutescens.

188 Convolvulus Nil.

185 Coronilla valentina.

192 Cypripedium acaule.

216 ---- album.

207 Dianthus barbatus.

214 Dracocephalum denticulatum.

189 Erica grandiflora.

194 Fritillaria imperialis.

203 Geranium angulatum.

206 ---- anemonefolium.

209 Hibiscus Trionum.

198 Indigofera candicans.

187 Iris sambucina.

184 Ixia crocata.

202 Lupinus peren