490 Charles Zeleny 
TABLE 7b—AMBLYSTOMA JEFFERSONIANUM. 
Series IIIb. (Results) 
| 
| AVERAGE SPECIFIC | AVERAGE SPECIFIC 
AMOUNT | RATE 
: : : | 
BirstmerenerattOue ele lt CASES islele\-lerers terior cle feeie ari) Latent ole 0.184 0.0184 
Hourthimepeneration—— ter cases iene yet ieee | 0.211 | 0.0211 
Imerease with successive TemOVal cee o- sey <= se seieles «sees + 0.027 + 0.0027 
| 
WETICEMMOLIMCHCASEtraeias(e aicieiels ects Setste te mise diate y alates nee 15 per cent | 
General Result. Each of the five series shows a distinct advan- 
tage in rate of the fourth or third regeneration over the first. The 
average increase is fifteen per cent and is to be noted not only in the 
absolute amount regenerated, but also in the specific amount and 
the specific rate. The number of individuals in Series Ib and 
IIla is too small to make these series conclusive by themselves, 
but in Series Ila, [Ib and IIIb the number of individuals is suffi- 
cient to prove the fact of the increase. When all the sets are taken 
together there can be no doubt of the general result. The five 
series should not be averaged together for a strictly accurate 
determination because the factors involved are different in the 
different series. ‘The special factors that differ are given in sources 
of error, Nos. 1, 4 and 60n pp. 483 and 484. The average increase 
is put down in the tables merely as an indication of the general 
trend of the results. 
2 ‘The Margin of the Disk in the Scyphomedusan, Cassiopea 
xamachana" 
For the method and other details the reader is referred to the 
original article. A brief statement of the results is given here for 
the sake of completeness. 
The first regeneration of the outer margin in three individuals 
was compared with the second regeneration in two other individ- 
uals as shown in Table 9; the second regeneration is distinctly 
more rapid than the first. The considerable individual varia- 
tion should, however, be noted. 
14 Journ. Exp. Zodl., vol. v, no. 2, pp. 265-274, December, 1907. 
