268 ‘ BOTANICAL GAZETTE [SEPTEMBER 
EXPLANATION OF PLATES XI-XIII 
All drawings were made with an Abbé camera lucida at table level and 
Zeiss apochromatic objectives and compensating oculars. For fig. 7 the 8 
ocular and 2.0mm. objective were used, giving a magnification of 1500; for 
the remainder of the drawings the 18 ocular was used with the 2.0mm. 
objective, and the magnification was 4000. All drawings were reduced one-half 
in reproduction. 
PLATE Xi 
Fic. 1.—Egg before fertilization, with nucleus in resting condition; 
X2000; L. philadelphicum. 
Fic. 2.—Male nucleus in early prophase; egg nucleus in resting condition; 
X2000; L. philadelphicum. 
Fic. 3—Chromatin of egg nucleus more irregular; male nucleus still 
curved around egg nucleus; 2000; L. philadelphicum. 
Fic. 4.—Male nucleus soded: X2000; L. longiflorum 
Fic. 5.—Early spireme in egg nucleus; 2000; L. pieiladelphicum. 
Fic. 6.—Distinct spiremes in male and egg nucleus; segmentation begun; 
X2000; L. longiflorum. 
Fic. 7—Endosperm nucleus undergoing division while egg nucleus is in 
resting stage and male nucleus in contact with it shows a spireme; 75°; 
L. philadelphicum. 
PLATE XII 
Fic. 8.—Triple fusion: male nucleus in spireme stage, upper and lower 
polar nuclei with chromatin in resting stage; 2000; L. longiflorum. 
Fic. 9.—Distinct spiremes in 3 nuclei of triple fusion; male nucleus at 
upper left; 2000; L. philadelphicum. 
Fic. 1o.—Metaphase of endosperm nucleus; 2000; L. philadelphicum. 
Fic. 17.—Second division of fertilized egg; 2000; L. longiflorum. 
PLATE XIII 
Fics. 11~13.—Three sections of spindle of fertilized egg in division, showing 
pairing of chromosomes, transverse break, moving of pairs to the Pe X 2000; 
L. longiflorum. 
Fic. 14.—Diagram of division of fertilized egg, made by superimposing 
figs. 11-13; the 12 pairs of chromosomes are represented, with 4 segments of a 
pair indicated by the same number; segments in solid black go to one pole, 
while those in outline go to the other pole; chromosomes numbered 8 and 12 
have not yet paired or segmented. 
Fic. 15.—Early telophase of first division; 2000; L. longiflorum. 
Fic. 16.—Late telophase of first division; 2000; L. longiflorum. 
