148 
yn a corn-meal agar plate and allowed 24 hours to grow, by which time a 
vigorous mycelium had developed. A goodly quantity of conidia of H. 
No. 1 was then placed in the midst of this young but well-established M8 
-olony, but it remained uniform to full occupation of the plate, showing no 
altations. 
Iniplanting conidia of H. No. 1 in a partly developed colony of the same 
irain.—This experiment was conducted like that of wounding except that 
nstead of using the hot wire conidia of H. No. 1 were implanted at the 
soints indicated in Pl. XXIX, below. All implants within the colony 
yrew sparingly and resulted in small clumps 1—2 mm. in diameter and 
lighly sporiferous (Pl. XXX, above). Implants at the edge grew poorly, 
nut those a few millimeters outside the colony became established and grew 
vell, each implant developing as an independent colony and inhibiting ad- 
vancement of the old colony, but bearing no resemblance to a saltant. 
[n one case, however, such implants showed marked change in characters 
und are still under culture as saltants (M70, Pl. XXX, upper fig.), though 
sfforts to produce other saltants in this manner were fruitless. 
Implanting other Helminthosporiums.—I\n a way similar to that of the 
ast experiment numerous other species or saltants (e.g. H. No. 2 and M6) 
vere implanted in an H. No. 1 colony, and always with the result that the 
mplant either failed utterly to establish itself or developed as an entirely 
ndependent colony that did not blend with the main colony, being in this 
unlike a saltant sector in character. If implants were put about 3 mm. be- 
yond the tips of the advancing mycelium, the conidia were observed to 
yerminate before the mycelium of the H. No. 1 colony arrived, but even 
such implants became entirely submerged and lost. 
Two entirely distinct types of Helminthosporium, found intermingled 
mn a single grain of wheat, were planted together—an oese of suspen- 
sion of the mixed conidia—on an agar plate. The resulting colonies gave 
the two types of Helminthosporium, but did not give the sectors so char- 
acteristic of saltants. 
Saltation not due to parasites —The saltant sectors and their transfers 
often differed so strikingly from their originals, particularly when they bore 
few conidia and had much white aerial mycelium (see Pl. XXVII) 
is to suggest that perhaps the great difference was due to a parasite 
srowing in the Helminthosporium colony. Close microscopic inspection 
of saltant sectors showed that there was only one type of mycelium present, 
that it was all indistinguishable from Helminthosporium mycelium, and 
