When entering Henry Garsey into Google, there are numberous entries. It seems Henry was a Reverend and a botanist and translated botanical books into english.

In the Church Missionary Society Archive, Reel 81, C A 097 I found an entry for the 'Original Papers Missionary Thomas R Garnley 1820-1821'

Also I found a sample of a book 'Personalities of the Forest of Dean' Fineleaf Editions 2007, first published in 1863 where Thomas Garnsley has a whole chapter to himself. This was found at www.fineleaf.co.uk