1898 ] GERMINATION OF FUNGUS SPORES 405 
function of the atomic weight of the element. To say the least, 
such a supposition is not strongly supported by this table. 
It may be well to add that where the words killed, dead, 
fatal, etc., have been used it is not intended to imply that life 
was really extinct, but merely that it was not evident. Experi- 
ments are now under way to determine, if possible, whether 
spores which have been prevented from growth by a toxic solu- 
tion can grow on being placed in one not toxic. 
SUMMARY. 
. Mercuric chlorid is the strongest chemical used in its 
doxic a9 upon the fungi. 
2. Potassium cyanid is remarkably weak coin its great 
toxic action on animals. 
3. Various fungi- offer different resistance to poisons. 
4. The limits of resistance vary in the same species. 
5. Alcohol and sodium chloride have a stimulating effect. 
6. In general the results are in accord with the theory of 
hydrolytic dissociation. 
7. A chemical may be twice as powerful as another against 
one fungus, but acting upon another fungus an entirely different 
ratio may be sustained. 
8. The spores of fungi are less susceptible than the roots of 
seedlings. 
9. The Bordeaux mixture holds far more copper than would 
be needed if it dissociated into simple copper ions. 
10. The cathions Hg, H, and Cu are poisonous. 
11. The anions CN, CrO,, Cr,O, and OH are poisonous. 
12. The halogen anions are not poisonous. 
13. Uromyces offers the greatest range in its susceptibility 
to poisons. 
14. The secondary spores of anthracnoses increase in abund- 
ance under the adverse conditions of a toxic solution. 
15. Spores protected by actual contact with others may ger 
minate and the tube may grow through a solution which in itself 
