For ice-minus, the proposed mechanism was that engineered organisms would displace natural ones, and the hazard was a disruption of ecological processes in which ice formation is critical.

The teacher paused in her lecture to allow the students to assimilate what she had said.

Fierce o'er their beauty blazed the lurid flame;

Of all intestinal antiseptics, calomel, salacetol, and ichthyoform have given us the best results, the latter being the least irritating.