In a beautifully clever and witty letter eventually published in Popular Science Monthly, she revealed that all her experts couldn’t distinguish between a male and female brain at birth. Even among adults, it would be a mere guess whether a given brain was male or female. The overlap between the sexes was just too big. Her sharpest observation was that the weight of a person’s brain couldn’t be a measure of intelligence, anyway. It was the ratio of body weight to brain weight or body size to brain size that was important.
