612 
EIBLIOGKAPHY. 
Schueelee, F. C.—Die Culturpflanzen Norwegens. Christiania, 
1862. 4to. pp. 197. With 24 plates. Also, (extracted from the 
same), Synopsis of the Vegetable Products of Norway. 4to. 
pp. 31. The latter work is intended as a guide to the vegetable 
products of Norway exhibited in London, 1862. It includes 
several interesting phyto-geographical observations. In respect 
of the cultivation of southern species in northern latitudes the 
author states the following results from his observations, which 
have extended over several years. Corn will ripen at a much lower 
temperature and in shorter time in Norway than in countries 
further south. If the seed be brought from a northern climate it 
will require at first a longer time to ripen than the same species 
cultivated in the north for a longer period, though after two or 
three years it will ripen at the same time. On the other hand, 
M. Schubeler remarks that if seeds be brought from a higher to 
a lower latitude they will, at first, ripen earlier than plants of 
the same species of the corresponding lower latitude, which have 
not been thus removed. Provided a species be not cultivated 
further north than it is able to attain a full development, the 
seed increases in size and weight for the first two or three 
years, the nearer it approaches this limit; it diminishes, in like 
manner, if cultivated further south. Again, the further north a 
plant is cultivated the deeper becomes the colour of the epiderm. 
This applies to the testa of peas and beans, and the petals of 
flowers. The foliage of both wild and cultivated species is re¬ 
markable for a greater brightness and verdure in the north. 
Loots, leaves, seeds and fruits, containing aromatic matter, deve¬ 
lop it to a very striking degree the further they are found to the 
north. Even the Bird-cherry, Mountain-ash, and Lily-of-the- 
Valley, are characterised by stronger aromatic properties near 
Throndhjem than at Christiania. The above phenomena the 
author attributes to the influence of the longer days of northern 
latitudes ; though whether to the heating or actinic solar rays— 
or both—or to some other influence—he leaves to further inves¬ 
tigation. 
Schultz ( JBipont ), C. H.— JPertya scandens. Bonpl. 1862, p. 109. 
With 1 plate. JPertya is a new genus of Mutisieae from Japan, 
perhaps identical with Thunberg’s JErigeron scandens. 
-Ueber Cassiniaceae uniflorae. Poll, xviii-xix. p. 157. 
—- u. E. W.— JPilosella als eigene Gattung aufgestellt. Flora, 
1862, pp. 417, 433. Pilosella is separated generically from Uiera- 
cium. The species are enumerated, sundry observations being 
added. Set eropleura, a new genus of Cichoraceae, is described. 
---Novum Cichoriacearum genus. Bull. Soc. Bot. ix. p. 284. 
Ceramiocephalum from Algeria, ( Lapsana virgata of Desf.) 
--— Observations in Kalbfussiam et Fideliam. Ibid. p. 286. 
——— Hieracii nova species. Ibid. p. 440. II. grandifolium, from 
Algiers. 
