488 KARLING: GROWTH AND REPRODUCTION IN CHARA 
34. West, W., & West, G. S. On the periodicity of the Se eee of 
some Seite lakes. Jour. Linn. Soc. Bot. 40: 395-432. f. 1-4 + pl. 
35. Williams, J L. Studies on the Dictyotaceae. III. The periodicity of the 
sexual cells in Dictyota dichotoma. Ann. Bot. 19: 531-560. 1905. 
Explanation of plates 11-13 
PLATE II 
1. Typical plant of Cultures o-1 and o-2 made 65 days after 
; ern and oogonia first appeared, a. 
Fic. 2. Typical plant of Culture 0-3 made 70 days after fruiting began, 
natural size 
I BS pical oe of Culture A made 14 days after antheridia and 
oogonia first appeared, 
Fic. 4. Typical eee plant of Culture A, X 3%. 
PLATE 12 
Fic. 1. Typical plants of Cultures 2 and B made 34 days after anth- 
eridia and oogonia were first formed, x 1 
Fic. 2. be dagioe plant of Culture C is its control made 50 days after 
fruiting began, X 
ecla plant of Culture E made 27 days after fruiting began, 
PLATE 13 
Dict plant of Culture F made 47 days after the culture was 
started, natural s 
1G52, A os) distal node of plants in the control of oe A after 
it had been left uncovered in the laboratory light 22 days 
Typical plants of Culture A made two months — he experi- 
ment was terminated, X 114 
