542, PRINCIPLES OF BOTANY, ETC. 
mous, as in fruit-trees, or watery and limpid, as if 
the vine. ‘This last species has been: styled Jacry- 
matio. ‘Vhe gummous haemorrhagy proves rarely 
fatal, but should not be allowed to make too much 
progress, and the wound should be healed up by 
wax. hat which happens especially in the vine, 
has no bad consequences whatever. For this plant 
performs the same functions in winter as all ligneous 
plants, (§ 277).. The radicles of it, which have 
been formed during the cold season, imbibe a great 
deal of moisture from the ground, which they con- 
vey to the stem. But as the weather is not soon 
enough favourable for the shooting of it, and as the 
radicles take up more sap than the tender stalks can 
Keep in, the superfluous sap exudes from the gems 
or buds. In warm climates the vine does not lacry- 
mate; for there the leaves can unfold themselves 
instantly, and the sap of course is properly digested. 
This watery discharge of the vine is not therefore to 
be considered as a natural secretion peculiar to the 
plant, but as the effect of cold climates. It how- 
ever does not hurt the vine, 
§ 310. 
Albigo ox mildew, 1s a whitish, thinnish coating of 
the leaves of plants, which often causes their decay. 
It is produced by small plants, or by insects. The 
first kind appears on the leayes of Tussilago Far- 
fora; Wumulus Lupulus ; Corylus Avellana; Lami- 
um album ; ; purpureum, and others, It is a species 
of fungus of great minuteness, which covers the 
leaves : Linné calls it Mucor Erysiphe, 
At | The 
