18 
noticed since. Probably a hundred plants have been examined, 
most of which have been dug up, and the connection with the sus- 
taining plant in many cases traced and verified. But in order to. 
remove all doubts which may have arisen or been left in my own 
mind, the most extended and careful observations were made th 
past summer, since the locality was convenient and the material 
abundant. As far as these investigations have extended, they 
indicate that Aphyllon in this place grows on Artemisia alone, 
and the experience obtained by searching for connections with 
other plants goes to show that such relations are extremely prob-_ 
lematical. And while it would not be safe to say that it may not 
also be found attached to other plants here, since there is evi 
dence that it can grow on Pelargonium, Eriogonum and grasses, 
I have failed to find it on Arctostaphylos Uva-urst, or any grass- 
plants on which it was inferred to be parasitic. Nor would any 
proof be deemed valid which did not show the union of the two 
plants. 
Aphylion Joscicidanenl, Gray, is a common plant by the shore 
of Lake Michigan, between Edgemoor and Pine, railway stations 
in Lake Co., Ind. It is especially abundant near the latter place. 
In their season hundreds of plants can here be found growing im 
the loose sand, partially shaded by scattered trees or clumps of 
Pinus Banksiana. This sand affords unusual facilities for tra 
ing the connection between the host-plant and parasite, since 
is easily dug up, though the root fibrils on which the haustorium 
is often formed are so delicate as to sever the connection by ve 
slight disturbance, and require most careful handling. In so 
cases the inference might be drawn that there was no host what- 
ever, if judged by superficial appearances. A little experience 
showed that surface indications were a deceptive clue to the su 
terranean connections. An Aphyllon might stand very near 4 
bunch of grass, or shoot up even among the trailing stems of 
Arctostaphylos, but the thread-like root joining the plants | 
invariably to an Artemisia. Some were found within an inch 
two of an Artemisia plant, and the inference was natural th 
they were joined, but the real host would be a foot or two awa 
This led to a careful study of the root-system of Artemisia 
n the present case A. Canadensis—and its comparison with tho 
