406 Scientific Intelligence. 
The effect of Barberry-bushes in rusting Wheat, after having 
long been accounted a steers gt popular superstition, is at 
length understood and admitted the Cryptogamists. The 
botanists used to rebut the charges oh the farmers by the statement 
that the rust in the grain fields and the prevalent fungus of the 
Barberry belonged to very different genera, and that therefore the 
one could not give origin to the other. But DeBary in Germany 
and (Ersted in Denmark, following up similar enquiries by Tulasne 
in France, as concluded that Ur edo, Puceinia, and Cteidium 
are to be regarded, not as so many genera, but as three successive 
forms of fructification of the same fungus, or in some sort an alter- 
nation of generations. DeBary sacsentatinedt that the spores of the 
Puccinia graminis do not germinate when sprinkled on the leaves 
and stalks of the cereal grains, which this rust infests, while they 
germinate on the leaves of the Barberry, and there give rise 
to the “eidiwm Berberidis: and the spores of this are equally inert 
upon the Barberry, but will grow in their turn upon Wheat, an 
summer, in France. ‘wae ete of Barberry, planted along the 
i eC 
na 
complained of ee the Adjacent cultivators, and were cut aw 
The turning green of’ et etiolated plants, or in other words the 
ction of chlorophyll upon exposure to light, was found by 
sir te to take place rere more promp tly under diffuse dn 
Shiba: 
sities of t the same Teht m which the calorific rays had ‘heen 
out, and pio b y pacing them in a cone 0 
t at “different distances from ti e focus of the co pdenaise lens; 
the brightest light rem ‘aed 4 apparently unchan: in 
exposure which had sufficed to develop a decided 
ler i ‘illie ‘s the erence 
; 1 Ilis formed promptly ne 
proper r intensity, and not bey ond ; _that 
