182 BOTANICAL GAZETTE [FEBRUARY 
Although the mosaic disease of tobacco may produce all phases 
of catacorolla in the blossoms of N. Tabacum, other species rarely, 
if ever, show this abnormality in connection with the mosaic 
disease. Although petunias, Datura Stramonium, Nicotiana glauca, 
N. longiflora, N. silvestris, N. alata, 
etc., are readily infected with the 
mosaic disease of tobacco, the writer 
has never observed the occurrence of 
such abnormalities in the blossoms 
of these plants affected with the 
mosaic disease. 
Likewise, the blossoms of N. 
glutinosa affected with a mosaic 
disease similar to but not identical 
with the mosaic disease of tobacco 
have never yet shown the catacorolla 
abnormality. It is interesting to 
note, however, that first generation 
plants of the cross N. Tabacum 
(2). glutinosa (4) show all phases 
of catacorolla when affected with the 
mosaic disease of N. glutinosa, to 
which these hybrids are suscep- 
tible. These facts indicate that 
catacorolla is more readily induced 
G. 8.—Plant of first generation by the mosaic disease in blossoms of 
es cross Maryland Mammoth (?)X NN. Tq@bacum than in many other 
Yellow Pryor (4), showing develop- . ee 
ment of growing points; character species of Nicotiana. 
appeared in many plants of first Normal blossoms and abnormal 
generation of this cross; plant blossoms showing all degrees of cata- 
branch is 28 in. ed smaller 21 in. corolla may frequently be shown on 
in height.—T. 160 the same branch of the inflorescence. 
Although the inciting cause is associ- 
ated with the mosaic disease of tobacco, conditions which disturb 
normal growth, such as cutting back, starvation, etc., tend to 
accentuate the expression of the abnormality. 
WHiTe’s observations show that catacorolla may sometimes 
appear suddenly in connection with a cross and persist in the 
