PLATE 3 
EXPLANATION OF FIGURES 
Cross section of Q;, section 2 3/3, cut at region where bulb joins cerebrum. 
Q;, 30-day control rat, killed when weaned. Brain weight, 1.3164 gram; bulb 
weight, 0.0238 gram. Magnified 30 diameters. 
Cross section of My, section 4 1/1, cut same region as figure 5 above. Mas, 
underfed 30 days. Brain weight. 1.4613 grams; bulb weight, 0.0251 gram. De- 
fective diet. Magnified 30 diameters. 
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