ZOOLOGY: L. R. GARY 
611 
3. In a race of Paramecium which upon extended examination shows 
no hereditary abnormalities, conjugation results in the appearance of 
many lines which are hereditarily abnormal, others which are normal 
throughout. 
4. In the diverse lines descended from the separate exconjugants of 
a conjugating culture, the two lines descended from the two individuals 
that have conjugated together tend to be alike in respect to normality 
or abnormality. That is, if the progeny of the exconjugant a are abnor- 
mal, the progeny of its mate b are more frequently abnormal than would 
be the case if the distribution of abnormal races were not affected by 
conjugation. 
Our main result, therefore, is that in respect to these abnormalities, 
while some lines are constant in hereditary character, in others h cred- 
itable variations do occur within the line, so that by selection it is possi- 
ble to break the single stock into a number of stocks differing hered- 
itarily. The genotype in these cases therefore does not remain constant 
in uniparental reproduction. The condition on which evolution through 
selection depends is therefore realized in respect to these characters. 
The complete paper of which this a summary appears in the Journal 
of Experimental Zoology. 
1 Calkins, G. N., and Gregory, L. H., Variations in the Progeny of a Single Exconjugant 
of Paramecium Caudatum, /. Exp. Zool.y IS, 467-525 (1913). 
THE INFLUENCE OF THE MARGINAL SENSE ORGANS ON 
FUNCTIONAL ACTIVITY IN CASSIOPEA XAMACHANA 
By Lewis R. Cary 
DEPARTMENT OF BIOLOGY, PRINCETON UNIVERSITY 
Presented to the Academy. October 27, 1915 
1 . The Influence of the Sense Organs on the Rate of Regeneration. The 
conclusion of many of the earher workers on the problems of regener- 
ation that the nervous system had an important part to play in the 
processes of regeneration has been attacked by most of the more recent 
students of these problems. While Bardeen ('01), Herbst ('96), Gold- 
stein ('04), Wolff ('95, '02) and others maintained that there was some 
direct influence of the nervous system, or some portion of it (sensory 
ganglia Herbst), and Child ('04) recognized the indirect influence of the 
nervous system, exhibited through muscular activity; Goldfarb ('09), 
Stockard ('09) et al have denied that there is even an indirect influence 
of the nervous system. 
An especially favorable opportunity for studying this problem is 
