They were the most promising, most committed students, and all of them made botanical expeditions to various places in the world, often with his help.

In 1938 he began his first botanical expedition, albeit as an amateur on his own initiative.

He studied mathematics, translated medical works into French, and undertook botanical expeditions.

He conducted a botanical expedition in Spain and Morocco during the years 1791-93.

From 1786 to 1797 he was the leader of a royal botanical expedition to the Philippines.

In 1904 he began making annual botanical expeditions to Guatemala.

In 1840 he left home to begin his extended botanical expeditions.

He led a botanical expedition to the Caucasus in 1802.

The meeting between the two scholars are considered the brightest spot of the botanical expedition.

Kirk took part in a number of botanical expeditions, writing and publishing reports on the results.