- 9 - 
Successfully inoculated Datura inermis , D. metel , Phys alis 
francheti , Solanum atropurpureum , S. m arginatu m, and S. 
tuberosum ; few sporangia on hosts other than potato. "In 
Finland (Pusula parish. Hyrkkyla village) it has teen pos- 
sible to ascertain by experiments, that Syn chytrium endobioticu m 
resting sporangia retain their viability in meadow land at 
least 13 years (Tables 1 and 2, p. 28-29). The strength of 
the infection of the disease has been greater in meadow lands 
than in such soils which are annually tilled." The table on 
p. 28 shows 80% contagiousness the 13th year; the table on 
p. 29 shows 75% contagiousness and 55% contagiousness in 
cultivated soil 7 years and 8 years after potatoes were grown, 
p. 234. "In Finland an ordinary 8 year rotation of the 
cultivation of corn and mowing grass has prevented the dis- 
ease in ordinary agricultural cultivations." Fertilizers 
increase wart, resulting in practice of using "fresh" soil 
from sound fields as fertilizer in Finland. Transporting 
of wart by human feet mentioned by Sanders (1919) and Neu- 
weiler (1923). "Also in the potato wart areas of Finland 
the spreading of the disease from one cultivation to another 
in the earth adhering to footwear has teen proved." "It 
was proved in 1929-1930 on the potato wart infected areas 
of Hyrkkyla village of Pusula parish, that Synchytrium endo - 
bioticum sporangia were preserved in life even over winter on 
implements plastered with earth." 
p. 235. Wart sporangia occur in intestines of earthworms 
in wart infected areas. Quarantines recommended, Finnish 
laws require that imported potatoes be grown at least 50 kms. 
from nearest wart infected areas. (50 kms. almost equal 31 
miles) immune vars. - "The cultivation of potato varieties 
immune to wart disease has considerably affected the extent 
of spread of potato wart, as this is the most general and 
reliable eradicative means." 
p. 236. Formalin, 10 litres of 10% per sq. metre failed so 
first infected area in Finland was given 3 litres of 20% 
unrefined sulphuric acid and copper sulphate 1 kg. pr sq. 
metre. Apparently successful. Chemical eradication not 
practicable. Wart found in Finland in 1924 in 5 small areas, 
in 1925-26 no new areas found, but since 1927 new infected 
areas have been found each year. "The writer's detailed 
investigations of the potato areas in Finland made in 1925- 
1932 have proved however that the disease has reached Fin- 
land with three different consignments of potatoes (1893 
to Pusula from England, 1929 to Nauvo from Holland and 1929 
to Joutseno and Lappi from Germany) and spread from these 
centres of infection caused by them to the surroundings and 
even to more distant tracts through the agency of cultural 
factors." The Holland potatoes are consigned by Messrs. 
