It is shown that the mother-substance, the zymogen, of the clot-inducing substance is not simple but is a compound of the enzyme and an inhibitant for that enzyme.

Pull the pin out of the grenade before throwing it at the enemy.

Wealth's golden key displayeth she, / And robes of state she weareth, / And the jewell'd star of high degree, / Fix'd at her bosom flareth.

I was loth to interrupt the thoughts that played over her fairhood like a summer's cloud athwart the morning sky.