1898] GERMINATION OF FUNGUS SPORES 403 
With the hydroxids the toxic effect rests with the anion, and 
as far as positive results were secured, they agree precisely. It 
may be noted, in passing, that the Bordeaux mixture, 22-gallon 
formula, estimated on basis of copper content, would be of about 
% strength, whereas these experiments show ,#, for copper is 
sufficient to prevent growth, except in extremely rare cases, 
while 745 is usually fatal to the spores with which it comes in 
contact. It is possible, however, that in Bordeaux mixture the 
copper may enter into the formation of a complex molecule, pro- 
ducing in dissociation a complex ion containing copper which is 
inferior to the copper ion itself in toxic action. This subject, 
however, is now under investigation and will be treated of in a 
Separate paper. 
TABLE XXII. 
| Pisum | Zea Lupinus Penicillium Uromyces 
ee a: roi es ce a 
H,SO, oe a eee re me rt o Too 
Oe = — = a = 
oo, 5. a aes os Pe ca 
Ca(C,20,), 60. 5. = | | & : dos 
on <i as | oS | ee 
ee a on a ies = = 
SSC a era pe ee CD 
It may be of interest to compare the results of this work on 
fungi with that of Kahlenberg and True on phanerogams. Table 
XXII brings together the results upon such substances as we 
have used in common, and also renders it possible to see ata 
glance the relative susceptibility of the fungi-and phanerogams. 
The first two columns are the result of work by Heald, the 
third that of Kahlenberg and True, and the last two are recorded 
