Fig. 6 There is a large and a small area of extravasation on the head of this 
foetus. The mother was injected intravenously with 30 me. of radio-active 
solution and three young, about full term, were born twenty-four hours later. 
All were dead. In this case the attached placenta is apparently normal. 
Fig. 7 The lower figure (A) shows an embryo with two dorsal head lesions 
and an apparently normal placenta. This is a litter mate of the animal shown in 
figure 6. At B is indicated a large haemorrhagic placenta from the third young 
of this litter, which itself was apparently normal. 
Fig. 8 Dorsal view of a young rat with the skin dissected to either side. 
There is a prominent area of meningeal extravasation in the frontal region. 
This animal was treated in utero with 1350 mc.hrs. of gamma-ray radiation on 
TFebruary 21st and was born apparently normal on February 23rd. It died on 
March 3rd. 
Fig. 9 Dorsal view of a young rat showing areas of frontal and occipital extrav- 
asations which were within the meningeal sinuses. There is a smaller lesion 
in the left dorsal thoracie region. This is a litter mate of the animal shown in 
figure 8, and the experimental conditions were identical. Death occurred on 
March 3rd. 
Fig. 10 There is an extensive meningeal extravasation over a considerable 
portion of the hemispheres, and a haemorrhagic lesion is shown on the reflected 
skin from the dorsal interscapular region. This is a litter mate of the aniraals 
shown in the two preceding figures. Death occurred on March 2nd. 
142 
