I still remember finding this when on holiday with my parents when I was probably no more than 10 – I immediately read it cover to cover and sought out the others in the series. When I came to re-read it however, I was immediately struck by a certain amount of casual racism (not uncommon in 1928) and of course its attitudes toward women were also pretty retrograde. Moreover, with their powerful weapons the heroes seem quite happy to kill off hordes of alien ‘bad guys’ even when they can’t shoot back. The racist and eugenicist undertones became stronger and stronger near the end however. The ‘bad aliens’ are darker skinned than the ‘good’ ones, and I just got to the point where the hero describes the religious system of the good aliens, seemingly without dismay:
“They are magnificently developed for their surroundings. They have attained this condition by centuries of weeding out the unfit. They have no hospitals for the feeble-minded or feeble-bodied—abnormal persons are not allowed to live. The same reasoning accounts for their perfect cleanliness, moral and physical. Vice is practically unknown. They believe that clean living and clean thinking are rewarded by the production of a better physical and mental type.”
Ugh… I didn’t remember that part!