This memorandum contains artificial gravity considerations for Project Apollo and was directed to Seamans, Wernher von Braun, Donlon, and Gilruth. Silverstein writes that he believes it is too early to tell if the Apollo spacecraft is capable of providing artificial gravity.
The memorandum contains a paper titled, "Apollo - Should It Be Committed to Weightlessness." This paper contains information about artificial gravity and the effects of prolonged periods of weightlessness on human beings and chimpanzees.