- ID - 
N. A. V. von Ende & Zoons of the Hague. 
p. 237. It is stated that a detailed study of the spread 
of the disease in Finland, including records of movement 
of families as shown in church registers of the communities, 
was made and is given in main text. Some of these noted on 
pp. 237 & 238. On one estate losses in gardens of workers 
averaged 30.6% while on the estate fields it was only 5 % 
due to the 3 to 12 year interval between potato crops on 
this land. 
p. 239. "At the end of 1931 there proved to be potato wart 
in Finland (Table 46, p. 117) all in 28 villages on the 
areas of 15 communities. Isolated areas said to be at the 
time a total of 205, had been in the possession of 163 culti- 
vators. The total area of the tracts infected was 23 hectares 
87 ares and the average crop-loss 7.4%." 
pp. 239-240. Give some details of infection in different 
population densities, different soil types, different lengths 
of time between potato crops. 
p. 241. In Sweden at end of 1930, 1725 hectares infected 
according to information from Thore Lindforss. Norway 48 
localities infected. 
p. 242. Disease thrives in Faroe Islands where average July 
temperature is below that of Finnish Lapland. About 6,000 
infected cultivations in Denmark at end of 1928 according to 
Nielsen. 
p. 243. 1741 communities in 280 district areas infected in 
Germany, everywhere about but especially Prussia, 
p. 244. "In Holland potato wart occurs (Fig. 12, p. 172) in 
different parts of the country. In the year 1920 the disease 
was found in 135 cultivations making a total area of 75.36 
hectares. In 1922 the said area was already 410 hectares 
and it has continued to grow yearly (e.g. in 1928 by 142 
hectares)." Chiefly around Winschoten, in northern part of 
country but also in southern part on banks of river Maas and 
near Amsterdam. Spread almost exclusively in parts with 
slight rainfall. - Distributed largely according to density 
of population. 
pp. 245-248. Discussion of situation in various countries 
especially with reference to correlation of wart and popula- 
tion density. 247 - wart in Poland in area formerly part of 
Germany. 248 - report for Japan on basis of information 
given by Pethybridge to writer in 1931. No specific informa- 
tion, p. 249. Believes So. America original home of wart. 
Fig. 12. Communities in Holland infected with wart disease 
of potatoes by end of 1927. - Drawn up by the author on 
particulars presented in literature. 55 numbered and named, 
(on p. 172.) (Maps of other countries shown also.) 
