residu2l xradiaticoa and thermal burns thatchould heve cecimaica tho population each time, In addition, it hos bsen cxposed to levels of vadiation which Should have caused the maricd gonatie effects, and I fully ompoct to Pind geaciic effcecis and reduc 8] BY et QO “o Ko} & t Cs It at Q to a t i ioe a ts Oo 3 Q (6) aed by to o iy © ce 3 a in this case; © bs in two othor closely related races, the avoraga nuwbor was 4.2, and i beliisve 3.7 ard 3.8, peo? was four, The avorcve nunber of embryos por litts 3} stance, 22 por cent, is g3 G > “Oo ww sv 4 Ee Be 2, seat ating V4 4 0 4 as tion in the over-all plaabilitvy of. the rots as+ a whole, but &¢ cP 13 SSN ratio cdcés not vary from a £9-59 vaiio, and except for those individu taken shortiy altter detonation, all individuals examined by our poonie have appearca to ba in ood paysical conGition, snd wa judsead the physical condition by the conditioa s of the fur and eyos, length-weicht ratio, “fat denosition and the activity of the animal, .In addition to this, the main colony has, as of nov, ctually been continually expandins, Thay are becinning to co ake over grass areas in waich they were not found before. I think this effect is cue to the populstion pressure in tho present colony area with a reduced amount of food; although a goodly amount of fat was found in the rats, there was no instance wWaere wo found evidence of cosconoration, AM. onbrycs examined anosaread normal, It boils dovm to the fact that you cannot find any effect