
The SciencesJanuary 1, 1961
Salpa
With the vast spaces of most of the oceans for a habitat this delicate creature has developed a curious life cycle that stretches the reproductive processes to their limits

Salpa
With the vast spaces of most of the oceans for a habitat this delicate creature has developed a curious life cycle that stretches the reproductive processes to their limits

The Indestructible Hydra
This tiny fresh-water animal can be cut into as many as eight pieces, each of which then grows into a complete individual. Recent studies have illuminated how it grows and regenerates