I keep pounding away at the total lack of context provided by so many questioners on here. The piece in question is from George Orwell's "Burmese Days", a semi-fictional work based on the author's brief spell as a police officer in Burma in the 1920s. It is a tale from the waning days of British colonialism, when Burma was ruled as part of the Indian empire - "a portrait of the dark side of the British Raj." At its centre is John Flory, "the lone and lacking individual trapped within a bigger system that is undermining the better side of human nature." Orwell's first novel, it describes "corruption and imperial bigotry in a society where, "after all, natives were natives - interesting, no doubt, but finally...an inferior people."
The material quoted is from a section which takes place in a place called Kyauktada, in a "European club" where local colonial officials and other white men gather. Such establishments were common throughout the empire, and other countries in Asia and Africa.
Ellis is reading the club noticeboard.
He sees a notice placed there by Mcgregor, who is not only an important colonial offical, but also the secretary of the club. It suggests that the club should alter its rules to allow non-white (mainly Indian and Burmese given the location) membership.
As is plain from Ellis' folowing remarks, he does not like the idea, so his description of the notice as a "little nosegay" (i.e. something to make life more pleasant) for everyone is definitely sarcastic.