Decembeb 24, 1915] 



SCIENCE 



909 



Thirteen plants examined fall into three 



groups, as follows: 



(a) Stems and midribs of leaves dark crimson ; 



buds entirely green. Three. 

 (6) Light green stems, slightly speckled or 



washed with reddish; midribs light green; 



calyces broadly striped with red, as de 



Vries- figures for CE. JiooTceri. Six. 

 (c) Red stems and mid-ribs, and red-striped 



buds. Four. 



Thus there is rather absence of correlation 

 than negative correlation, except that no green- 

 stemmed plants with green buds were found. 



Mr. H. H. Bartlett, who grew CE. hewetii 

 from my seed in 1914, found the plants di- 

 verse, and mostly self-sterile, which led him 

 to suggest (in litt.) that the form might be of 

 hybrid origin. My plants seem quite uniform 

 except in color, as described above, and in the 

 size of the flowers, which seems to vary largely 

 according to the condition of the plant, or on 

 the same plant according to position.^ No 

 other (Enothera was observed in the original 

 locality of hewetii, and the only species grow- 

 ing in the vicinity at Boulder (until last sum- 

 mer, when I had a single small plant of CE. 

 rubricalyx) is CE. cocherelli Bartl., one of the 

 small-flowered group. It seems probable that 

 CE. hewetii is a pure species, which varies or 

 mutates in the same manner as other mem- 

 bers of the genus. 



I have this year a very fine plant of CE. 

 rubricalyx, which is even redder than Gates's 

 original figure,* having the buds, including 

 the hypanthium, entirely dark red, excepting 

 the green sepal tips. The stems are dark red, 

 more or less streaked with green, but the mid- 

 ribs are green, only faintly speckled with red. 

 Thus this intensely pigmented plant has the 

 midribs much less pigmented than in the red- 

 stemmed form of heweiii, although the buds 

 are very much more intensely pigmented than 

 in the latter. T. D. A. Oockerell 



TJniveksity of Colorado, 

 July 18, 1915 



^ ' ' Gruppeuweise Artbildung, ' ' pi. VIII. 



3 This refers to the grown plants. Some diver- 

 sity in the rosette leaves was noted. 



* Zeits. f. indukt. Aistammungs-u. Vereriungs- 

 lehre, Bd. 4, pi. 6, f. 8. 



QUOTATIONS 



THE CONVOCATION-WEEK MEETINGS OF SCIENTIPIO 

 SOCIETIES 



The scientific men of the country will hold 

 their annual meetings this year at widely sep- 

 arated places and with some conflict. The 

 American Association for the Advancement of 

 Science is responsible for the arrangement of 

 the convocation-week meetings, having four- 

 teen years ago transferred its own meeting 

 from mid-summer to the Christmas holidays. 

 At the same time it obtained from many uni- 

 versities and colleges an extension of the 

 Christmas holidays or grants for leave of ab- 

 sence, so that the week in which New Year's 

 day falls should be free for these meetings. 

 The American Association arranges also for 

 the meetings of affiliated scientific societies 

 which may wish to meet in conjunction with 

 it. It is not expected that all these societies 

 will meet every year with the association, for 

 there are obvious advantages in the isolation 

 of a single society or a small group concerned 

 with related subjects, as well as in a large con- 

 gress covering all the sciences and numbering 

 its attendance by the thousands. 



In order to meet the complicated conditions 

 as well as may be, the American Association 

 has planned a program, according to which 

 once in four years there shall be a great con- 

 vocation-week meeting representing all the 

 natural and exact sciences, and perhaps, ulti- 

 mately, also engineering, education, econom- 

 ics, history, philology, literature and art. Such 

 a demonstration of the intellectual forces of 

 the country should be a stimulus to those who 

 join in it and an exliibition that would impress 

 the whole country. It is proposed to hold 

 these meetings once in four years and in suc- 

 cession in New York, Chicago and Washing- 

 ton. The first will take place in New York at 

 the end of the year 1916, and thereafter they 

 will he held in the four-year periods at which 

 the national presidential elections occur. In 

 the intervening two-year periods the meetings 

 will also be in large scientific centers, and it is 

 expected that most of the national scientific 

 societies will take part. The first of these 

 meetings was held in Philadelphia, and the 

 next will probably be held in Boston at the 



