"a theosophist or a Hindoo convert"

Theosophical Society emblem
Public DomainTheosophical Society emblem - Credit: unknown
Theosophy is a belief system which incorporates elements of Buddhism, Hinduism and Brahmanism, including belief in reincarnation and spiritual evolution.

The Theosophical Society was founded in New York in 1875, and still has branches in many countries, including Britain.

Hindoo is an old-fashioned spelling of Hindu.