DEDIFFERENTIATION IN PEROPHORA 657 
TABLE I 
EXPERIMENTS WITH KCN. 
Series A, Young and medium individuals, 
Series B. Very young individuals and almost complete buds. 
A and B, four stolon-zooid systems in each vessel, 
Dediff, = opaque, Clavellina type of reduction, 
resorption, 
Strength of 
Stages 1-6 refer to stages of 
Twenty-four Forty-eight Seventy-two 
KCN, hours. hours, hours, Remarks. 
Control A Normal Normal 3 normal, New growth on all 
l draining, — stolons, 
stage 3 
Control B 3 normal, 2 normal, As at 48 Slight new growth on all 
1 dediff, 1 dediff. hrs. stolons, 
1 draining, 
stage 4 
n/64,000, A 3 normal, 2 dead, 2 stage — Stolons healthy, new 
1 stage 4 5 growth on 2, 
n/32,000, A Normal All unhealthy, ~- Stolons healthy, slight- 
1 stage 4 ly turgid, new grewth 
on 2, 
n/32,000, B 2 normal, All draining, 2 dead, Stolons healthy, no new 
2 stage 3 stages 3-5 1 stage 5, growth, 
1 stage 6 
n/16,000, A 3 normal, 2 dead, 1 stage Stolons healthy, new 
1 dediff, 5, 1 stage 3 growth on 1. 
n/16,000, B 2 normal, 1 dead, ns Stolons healthy, new 
1 stage 3, 1 dediff., growth on 2. 
1 stage 4 2 stages 5-6 
n/8,000, A Expanded, cir- 1 dead, — Stolons nearly normal, 
culation af- 3 dediff, no new growth. 
fected 
n/8,000, B 2 normal, 1 stage 1, 1 dead, Some stolons healthy, 
2 stage 3 1 dediff., 1 dediff., some opaque, | with 
2 stages 4-5 2 stage 5 new growth (very 
slight). 
n/4,000, A Most stolons contracted; 
no new growth. 
All stolons opaque ; no 
new growth. 
Expanded, cir- 
culation poor. 
2 normal, 
2 stage 3 
2 dying, 
2 stage 4 
1 dediff., 
3 stages 4-5 
n/4,000, B All dead 
n/2,000, A | Expanded, cir- 1 dying, —- All stolons contracted. 
culation very 2 dediff., Cilia slow. 
poor 1 stage 4 
n/2,000, B 2 subnormal, 2 dying, — All stolons opaque, 
1 stage 3, 1 dediff., clubbed. 
' 1 stage 5 1 stage 6 
n/1,000, A Allsubnormal All dead or _— All stolons early af- 
dying fected. 
n/500, A 1 subnormal, All dead or — All stolons early af- 
3 dediff. dying fected. 
n/250, A Allabnormal, 2 dead, 1 dying, — All stolons early af- 
dediff, 1 dediff,, un- fected. 
healthy, 
