In brief, cruel and unusual experimentation on helpless animals in the name of science and research. Not a pleasant subject, but for a complete meaning, see this link:
The stamp you show above is a 1952 Anti-Vivisection Society Poster Stamp more commonly referred to as a "cinderella" issued by the National Anti-Vivisection Society. Here's one recent listing for this stamp:
Oh, now that is so sad... I hope this still isn't happening.. Enough sadness and cruelty in this world already..... Gosh... Thank you so much, SueStamps
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