The object of his surveillance was seated at a back table in the coffee shop, sipping a cup of something with frothy cream atop it.

The vomiting may take place every two or three days, enormous quantities of undigested food mixed with frothy, yeast-like mucous being thrown up. And whilst the stomach is slowly filling up again after one of these uncontrollable emptyings, sudden and violent movements of the individual may cause the fluid to give rise to audible "splashings."

From the 20th of November 1797, till the 9th of July 1798, he was one of the most active, and was certainly the most witty of the contributors to the Anti-Jacobin, a weekly paper started to ridicule the frothy philanthropic and eleutheromaniac rant of the French republicans, and to denounce their brutal rapacity and cruelty.

Haemoptysis denotes an escape of blood from the air-passages, which is usually bright red and frothy from admixture with air.

The young of many of these insects are green and soft-skinned, protecting themselves by the well-known frothy secretion that is called " cuckoo-spit."