Reports of Meetings

+ ve G) were countered with limited success by pressure suits, horizontal posture, etcUpward forces (i.e. ve G) were less well tolerated. Whereas the former caused first greying out due to loss of colour vision, then blacking out and final unconsciousnessi recovery usually took place on removal of the stress in good time. On the other hand* with negative G a red out occurred, leading to cerebral haemorrhage and death. I0 preventing these conditions many factors were involved, including good health, general fitness and constant practice. The difficulties were increased by the use of jet aircraft which, although simple^ quieter and less vulnerable to fuel fires, called for exceptional speed of thought, ability