FLORIDA STATE HORTICULTURAL SOCIETY. 
75 
periments in detail as possibly opening- a 
profitable field for investigation in rela¬ 
tion to diseases of oranges and other trees. 
Tetanus for instance, among germ 
diseases has been successfully treated by 
injections of solutions of carbolic acid and 
glycerine as well as with anti-toxin. Now 
if the absorption process described by 
Sheviryev will work on orange trees will 
it not be possible to' discover and directly 
administer antidotes or even anti-toxins 
for such diseases as limb blight, 
die back, foot rot and wither tip ? As I 
understand the preliminary work of isola¬ 
ting and studying the enzymes of orange 
trees is only fairly started at our State 
Experiment Station under the provision 
of the Adams act for original investiga¬ 
tions we cannot look for immediate re¬ 
sults in devising remedies but it seems to 
me the time is coming when the diseases 
of trees will be as well understood as those 
of animals and when remedies will be 
directly introduced into the plant sap cir¬ 
culation. 
i 
In conclusion I will say that W. Welch- 
ard (E. S. R. XVII. No. 5,486) reports 
that from the flesh of guinea pigs dead 
from fatigue he was able to extract a 
body which injected into guinea pigs and 
other animals caused all the symptoms of 
fatigue. This body was isolated and found 
to be very unstable in character and the 
author considers it a true toxin. When 
injected into the circulation of horses an 
anti-toxin was produced which in vitro or 
in animals counteracted the toxins. As 
shown by a number of experiments the 
anti-toxin can be taken by man without 
harmful results. 
In connection with the report of the 
experiments the author discusses the char¬ 
acteristic symptoms of fatigue, its effects 
on the body temperature, the produc¬ 
tion of the anti-toxin in the body and re¬ 
lated questions. Further, I can only say 
I have made these dry subjects as untech- 
nical as possible and hope they will give 
an idea of the trend of future investiga¬ 
tions, but if anybody has that tired feel¬ 
ing I am sorry to say I have not yet se¬ 
cured and am unable to administer the 
anti-toxin for fatigue. 
SOME DISEASES OF CITRUS TREES. 
By H. S. Fawcett. 
Mr. President, Ladies and Gentlemen : 
You may picture to yourself an ideal 
orange grove; one in which the trees are 
perfectly healthy; one provided with all 
the conditions favorable to growth and 
the production of the maximum amount 
of fruit consistent with this growth; one 
in which there is nothing to induce disease 
of any kind. This would require just the 
right amount of plant-food, of moisture, 
of regulated temperature and of light; 
a suitable substance in which a tree could 
fasten itself by a root system; and free¬ 
dom from all attacks of injurious insects 
