82 Affricultural Kx perunent Station Uesearcli Bulletin IJf 
six (subsurface), and 200 of the third six (subsoil) were i)laced 
in separate sacks, transported to the station at West Ivaleiafi, and 
1 ‘eplaced at tlieir original depths, in wooden frames sunk to the 
level of the surrounding soil. These types were arranged in a 
sequence according to the increase in the percentage of hue par- 
ticles. The types used were as follows and were arranged in the 
order given : Coarse sand, sand, fine sand, very fine sand, coarse 
sandy loam, sandy loam, fine sandy loam, very fine sandy loam, 
loam, silt loam and cla}^ (30).^ When arranged in this way, 
variation in the sequence from t}'pe to t}q3e was evident. They 
were each artificially infected with F. traclieiphih.nn fi’om soy 
bean and the nematode (Tleterodera radicicola) . A liberal num- 
ber of nematode galls from the roots of plants not susceptible to 
Fiisarmm and cultures of the fungus on cut stems were incor- 
porated into the upper six inches of soil. Soil acidity tests indi- 
cated that the different lots ranged from approximately neutral to 
slightly acid. ' 
At best it was hoi)ed to obtain, quite a])proximately. a series 
each part of which should vary from the others in its mechanical 
analysis but as little as possible in all other respects, and from any 
variations that might appear in the number and severity of result- 
ing infection to get some indication of the cause for the same. 
If the results should warrant it, a careful physical and chemical 
analysis could be made from samples of each ty])e that had been 
set aside for this ])urpose before the seed were planted. 
8oy beans and cowpeas were planted on July 8. 1017. and the 
cowpeas were removed after the disease occurred on several of 
them in each flat. The soy beans were harvested on September 26, 
at Avhich time the plants Avere mature, dlie results are presented 
in Table 6. 
I 
I 
U'or the mechanical analysis of these types sec 30, pp. 46-54, and soil surveys of 
various containing these types. 
