306 BULBS AND TUBEROUS-ROOTED PLANTS. 
cousin of the Lily Disease, if not the same thing. It has 
the hard, dark masses, or sclerotia, and the other struc- 
tures mentioned with the Botrytis (see engraving), and 
is probably Sclerotinia (Peziza) bulborum, Wak. 
The gummosis, so called, of the Hyacinth, also com- 
mon to the Tulip and Ixia bulbs, has likewise been 
studied by Walker. The pure white gum pockets are 
found mostly between the epidermis and tissue below, 
. the starch being replaced 
with gum by a process of 
degeneration. These gum- 
bearing cells may increase 
~~ abnormally in size. Walker 
wg) concludes that this gum- 
©“ mosis and the ‘‘ white rot” 
of Hyacinths are the same 
thing, and, having failed to 
produce the abnormal con- 
dition artificially by inoculation, affirms that there is no 
indication of the cause being due to a parasite of any 
kind. This last trouble seems, therefore, a purely physi- 
ological one, and there are many such among plants liy- 
ing under the pressure of high culture. 
The necessity for uninfected soil and healthy bulbs 
is thus shown by Dr. Halsted. In such cases it is also 
useful, according to Dr. William C. Sturgis, of the 
Connecticut Experiment Station, to thoroughly wash all 
implements used in infested ground, to burn all diseased 
plants, and, if possible, to burn over the ground on 
which they grew. As soon as noticed all diseased plants 
should be removed and burned immediately. For dis- 
eases of the leaves and other portions above ground, 
some of the usual fungicides may be found useful. Dr.. 
Charles H. Peck, State Botanist of New York, describes 
their preparation as follows: ‘The Bordeaux mixture, 
diluted to half the original strength, is made by dissoly- 
ing six pounds of powdered copper sulphate in ten gal- 
BOTRYTIS SCLEROTIUM. 
