Another in my list of classic sf to read.
This is an epic story of the future of the human race, starting in the present day (ie about 1930) and ending millions of years from now just before the destruction of the solar system by cosmic catastrophe. I think of Stapledon's epic yet detached tone as a peculiarly English style of writing; I detect it also in Brian Aldiss, Christopher Priest, and especially Stephen Baxter who is in many ways Stapledon's heir.
The weakest part of Last and First Men for today's reader is, unfortunately, the first section, where he describes a destructive war between England and France (a peaceful and neutral Germany standing by), followed by a succession of European conflicts which seem improbable to us. (In his foreword he hints that this is really a moral parable, a plea for the success of the League of Nations.) Also his instinctive racialism (I think that is the right word) strikes a sour note today. Still there are a couple of interesting hits, such as the sinister political party which adopts the swastika as its symbol, or the much greater longevity of the communist one-party state in China as compared with Russia.
Then we get onto the meat: the repeated near-extinction of humanity, whether through its own folly or natural disaster, followed by its reinvention of itself; emigration from Earth to Venus and then Neptune, having repelled invasion from Mars in the meantime; huge changes in the human form and lifespan. He achieves very well the epic scale of a few decades in one chapter, centuries in the next, millennia in the next.
Having said that, this is very much a book of telling rather than showing; his excursions into narrative rather than descriptive prose range from the unconvincing to the embarrassing. (I am thinking particularly of the scene where the nude island maiden brings peace between China and America by having sex with the negotiators.)
Yet despite its weaknesses, this deserves to be on the classics list. I think Stapledon's influence, directly or indirectly, reverberates through the sf of the rest of the twentieth century.