804 The American Naturalist. [October, 
yellow. April 3. No change. Anna Maria (double white 
variety). Fragments of diseased tissue introduced into wounds 
in the green tips of three leaves. Results: Feb. 13. A down- 
ward stripe from one of the wounds, length 10mm. On the 
other two leaves nothing. Feb. 20. In bloom. Length of 
stripe, 17 mm. On the other two leaves nothing. March 6. 
Length of stripe 35 mm., and small spots 10 mm. lower. 
March 13. Length ofstripe 45 mm. The stripe and border- 
ing tissues have dried up for a distance of 35mm. March 20. 
Length of stripe 55 mm., and small spots 15 mm. lower. Dis- 
eased part dry for a length of 50 mm. Leaf bent by the dry- 
ing of one side. Plant put out-doors. March 27. Length 
of stripe 90 mm. Dry for a length of 55 mm. April 3. 
Length of stripe 94 mm. 
Measurements were not made after April 3, but subse- 
quently all of the diseased leaves were removed, placed in al- 
cohol, hardened in absolute alcohol, and examined microscop- 
ically in the same manner as the leaf already mentioned, and 
with the same result. On the same date, Dec. 28, 1885, a 
quantity of bulbs, including the above varieties, were also in- 
fected and were planted out of doors where they were exposed 
freely to the air. Up to April 3 there were no signs of disease 
but a little later symptoms appeared in most of the plants. 
From these experiments the author draws the following con- 
clusions: (1) the Geelziek or maladie du jaune can be induced 
artificially, and (2) the results of the infection make their ap- 
pearance a long time after the operation. 
(To be continued.) 
