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counting cells on selected histological sections (3, 4) is subject to error in interpretation because the result does not give information about the increase in the total number of cortical cells unless it is assumed that this increase is similar in all directions. Clendinnen and Eayrs (5) have repeated some of these experiments (subcutaneous injection of pituitary growth hormone into pregnant rats) and found in the mature offspring a 20-percent increase in the cell-gray coefficient, 23percentdoi:10.1126/science.152.3727.1397 pmid:5949244 fatcat:apg6odmhtzbg5d2huaey2fomau