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Isolation methods similar to those already described were 
- followed. Whole plants as well as lengths of main and lateral 
roots were sterilised and placed in damp chambers. They 
yielded only the Fusarium in the form of the white, flocculent 
mycelial cushions showing coremial strand formation and bearing 
at first typical microconidia and afterwards macroconidia up to 
53 by 5u. The fungus occurred in this form on all parts of lateral 
and tap-roots but never on the stems. Several root tissue- 
fragment cultures were set up in prune agar, and they showed 
only the one’ fungus, the same Fusarium, originating from the 
fragments that proved fertile. .The material obtained in both the 
ways mentioned was used to institute sub-cultures on the mediae 
previously employed in the study of the cashew nut wilt fungus, 
and the colour-, mycelial-, and spore-development was typical 
of former cultures. Growth occurred in concentric rings in one 
case and coremial strand formation was commoner in this strain 
of the Fusarium than in any other. White, pink and honey yellow 
were the predominant colourings. In one glucose meat extract 
tube culture and one prune agar plate, the mycelium in the 
medium was of a pale blue colour recalling that found in one of 
_ the cashew nut hypocotyl growths. This blue colour persisted 
although it became less and less distinct. The chlamydospores 
were single or double while terminal, and single or in the usual 
small groups while intercalar, and they germinated in the same 
manner as those of the cashew nut Fusarium. There was, 
therefore, no doubt of the identity of the fungus attacking the 
Grevillea seedlings. 
INFECTION AND CONTROL EXPERIMENTS WITH THE 
FUuSARIUM FROM GREVILLEA. 
The conditions under which infection had taken place differed 
from those holding in the case of the cashew nut seedlings 
inasmuch as the Grevillea plants had been transplanted and root- 
pruned during the operation while the cashew nut seedlings had 
been undisturbed. On this account, it was decided to combine a 
control and infection experiment. Two affected beds were 
cleared of ail Grevillea plants, carefully dug over and treated as 
formerly, except that only one, the weaker, strength of Fungal 
was applied. A fortnight afterwards, one row of Grevillea seeds 
was sown lengthways in each bed so as to traverse the treated 
and the control halves of the bed, and a second line consisting 
of transplants was laid out parallel to the seeds. Alternate 
transplants in the treated halves of both beds were root-pruned, 
while all the plants in the control half of the Jzal-treated bed 
were root-pruned and none of those in the corresponding half of 
the Fungal-treated bed were root-pruned. 
After a few weeks, both rows of seeds had germinated, and 
at the end of ten weeks the resulting plants were well grown an 
' healthy. They remained so at the end of six months, and there is 
no difference to be noted between the sets of seedlings growing 
