100 BOTANICAL GAZETTE. [ April, 
e who are most familiar bea 8 subject. This destructive blight is due 
to “Mier ococcus amylovorus B., a bacterium discovered by Professor Burrill a few 
con i inu erms find 
e ight m 
entran e tree through the tender surfaces of flawers and young twigs in 
spring time and then multiply, ig gt e familiar burned appearance of the 
leaves and twigs in mid-summer areful one: tion of the juices accom 
panying the a and by Tong 3 series wor cultures in the usual way for the 
elimination of all foreign matter was de silted that the cause of the 
blight resides with the bacterium germ and “es ss ou enve ey he liquid. It 
: 0 
knife used upon all discolored branches should be vigorously applied. The 
rata Mas as apple and quince are of the same origin and require the same 
Pro essor Arthur has made observations on another blight or scab, Fusiela- 
diwm pyrinum Fckl., that works upon the leaf of the e pear. Another species of 
the same genus, F’ dendriticum Fckl., works in like manner upon 
lcd them with rusty spots, and upon the fruit, sometimes causing a 
The amount : smutted grain in an ordinary field of oats was at de- 
termined to be nine and one-half per cent. This strikingly points to the fact 
that doubtless the loss of grain from smut - greater than generally supposed. 
uch of the smutted grain is overlooked by the ordin ary observer. 
uce rust and mildew have both been subjects of investigation, and 
both are illustrated with cligreviney. The ru i ctucee Pass., causes 
the lettuce leaves to turn brown and bec ifit for u Experiments with 
fungicide et have develope no ot airpKs eg emedy. The mildew, P : 
_ tosh hela le DeB., is a genuine rot and a close relative of the potato rot. 
ew 
ettuce is a natural senrecatih der bed for this disease and should 
ve d. 
xtensive investigations have been made ~ eae the rotting of cherries and 
plums, caused by Oidiwm foiionden 8. & K. er is fungus age s the winter in 
decayed fruits that frequently remain hanging to the 
of potato-rot ie lettuce-rot are not the direct cause of the offensive pu- 
trefaction, but i it is due to the bacteria associated with them. We ve prop- 
— by its ose chemical products upon whi e bacteria a reo 
PAVE sos’, 5 inability of the usual Aes mag bacteria 
the resistance of the living cells and start a well ilustrated by 
Xperiments ormed in connection with aken: topics, art 
larly by the ineffectual inoculation o green tomatoes with bacteria taken 
ich were only bacteria and a mycelium. e 
