THE EFFECT OF SUCCESSIVE REMOVAL UPON 
THE RATE OF REGENERATION? 
BY 
CHARLES ZELENY 
CONTENTS 
Hea Tren trv 11th tote ia tire cs suc cea vecovcysvsievols onds owe ers AL cea steer etas re rafetarmescyoterate alalieterals wixicieievetsYaeVas 477 
FNTarn Gram eralinre (Od ererik che oc sac, favo cad, oooh os ecu ohats © otatetei val slats erenetolopeh a fereiotas (or eleiesore) cis %<\s1 sieve: atals 478 
III Experiments bytheauthor .......-.-..-.. 0s ese ee eee e neces ABR AR RE Hae AObe OSM U AE UGe 482 
A. Experiments on non-molting animals: 
1. The tailof the larval salamander, Amblystoma jeffersonianum...........--+--+ 483 
2. The margin of the disk in Cassiopea xamachana.......-.-++e+e+eeeeeeeeereees 49° 
B. Experiments on molting animals: 
3. The chele of the crayfish, Cambarus bartoni.......-. 6-6-6 eee eee cree seers 494 
4. The chele of the gulf-weed crab, Portimus sayi os'ct fies, eye eA case aerate 498 
5. The chelz of the gulf-weed shrimp, Palemon tenuicornis...........---+++++++ 499 
6. The chelz of the Wood’s Holl shrimp, Palemonetes vulgaris...........-.+-++--- 502 
MV | Data fromm other SOULCES josie tet crecale eye o10lm a'a1 6:2 wie lal sinia/elelotes¥ s| sued eustar-yel<taiaia al nbaknl a hetricls eta 505 
V_ General statement of the facts as obtained from all sources... .... 0.0600 eee eevee cere sees 507 
WAL. IDTRGERSIGh is Gua meee Anno cop manos coucrnmacuorc A oR RO Ree Bc 509: 
Wilt ‘Qiniink io ococueponoer nnpeeamadoosonesercosoMecueccncre bo oocmarbocs ou dcGr Gr) oO 510 
I INTRODUCTION 
The present paper contains the results of an analytical, quanti- 
tative study of the effect of successive removal of organs upon their 
rate of regeneration. It is one of a series of similar studies deal- 
ing with the effects of various external and internal factors. 
Because of the necessity of eliminating disturbing conditions in the 
case of experimentation with regard to any one factor, 1t was found 
desirable to make an extended simultaneous study of as many of 
the factors as possible. The present paper deals merely with 
successive regenerations. It was found in the best controlled series 
of experiments that successive removal causes either no change or an 
increase in rate of regeneration and not a decrease in rate. 
1 Contributions from the Zodélogical Laboratory of Indiana University. No. 108. 
Tue JourNaL or ExPERIMENTAL ZOOLOGY, VOL. VII, NO. 3 
