“A Note on Fingernail Growth”, 1953 (; backlinks):
Minutiae of growth and the wear and tear inherent in every day life have escaped the notice of all save the occasional natural historian of disease. Some years ago when looking for facts on nail growth I could find no studies of the long-term growth of fingernails.
Therefore, I set about to measure the growth of my fingernails to see whether seasonal or secular trends, sporadic or unpredictable variation occurred. Only recently did other studies come to my notice.
This paper sets forth observations made over the past 10 years, and some consideration of recorded observations on the topic.
…Fingernail growth, studied over a period of 10 years, revealed no seasonal variation but a slight slowing in rate of growth over the period. Average rate of growth has been 0.119 mm daily with extremes of 0.112 mm and 0.132 mm.
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