And because the bulbs contain mercury, there is a risk of pollution when millions of consumers throw them away.

The bulbs also contain a number of alkaloids.

"Energy-saving bulbs contain only tiny traces of mercury," it says soothingly.

"These three bulbs contain a powerful tranquilizing gas."

Each bulb contains in embryo all that it needs for a single season of bloom.

A fluorescent bulb contains gases and a phosphor coating.

Then, to Belmar's horror, he set his cigarette tip against the silvery paper that the peculiar bulb contained.

For example, the neocortex and olfactory bulb both contain neuropil.

The bulbs contain alkaloids and cardenolides, which are toxic.

The bulb of the plant contains chemicals that have been used as a medicine.