d 
: 
‘ 
; 
_ Sippi valley, I also found to be common at Santa 
b 
BOTANICAL GAZETTE. 347 
not say, but my opportunity for observing in that country was 
so limited that the fungus might have been very abundant there 
and still escape my notice. At Santa Barbara, however, I was 
able to make a pretty careful search, and as far as I could ascer- 
tain, the disease has not yet made its appearance there, but from 
what we know of the history of the spreading of diseases caused 
by other species of Peronospora, there is every reason to suppose 
that the disease which we are now considering will soon reach 
Santa Barbara. As tobacco is not an important crop in California, 
we are less interested in the spreading of the disease in that State 
than in its extension to the southern states. The Nicotiana 
glauca may perhaps spread northward and eastward until it 
reaches the gulf states, carrying with it the Peronospora, but it 
is too tender to stand the winters. further north without protec- 
tion. What is also to be feared is that in advancing eastward 
the fungus may be communicated to some species related to the 
Nicotiana glauca, as for instance Hyoscyamus niger, and thus be 
transported north of the limit where the Nicotiana glauca might 
grow, but where NV. Tabaccum, the tobacco plant, is cultivated. 
But this supposition is almost superfluous, because 1 ieotiana 
glauca and its parasite are once introduced into the gulf states 
the parasite might attack the tobacco grown there, and then pass 
on to Virginia and other states where tobacco is the most impor- 
At the Minneapolis meeting I stated in a paper read before the 
Association that Peronospora Halstedit, although one of the com- 
Pacific coast. Lam indebted to Deca. Harkness for speei- 
iva, near San od 
cisco, which is identical with P. Halstedii, so that this typically 
: i the continent. ¢rono- 
anta Cruz, on Artemisia [udoviciana. : 
The hollyhock disease, Puceinia Malvacearum Mont, vn’ 
Was originally noticed in Chili, has in recent years OE b 
Europe, and its progress has been more carefully wate : ny 
otanists than that of any other plant disease, the potato-ro vai 
8tape-mildew perhaps excepted. But while the two diseases 
ramed extended to Europe by way of North America, pei 
hock disease, apparently, was conveyed directly aie alas 
America to Europe, and did not pass through the Unit , 
