FIGURE 2 | Camera lucida drawing of a human spermatogonial metaphase made by Theophilus S. Painter.

From the following article:

The chromosome number in humans: a brief history

Stanley M. Gartler

Nature Reviews Genetics 7, 655-660 (August 2006)

doi:10.1038/nrg1917

The chromosome number in humans: a brief history

The drawing presumably shows 48 chromosomes. The cytological methods used were state of the art for the time, but it is still difficult, if not impossible, to make an exact count. Reproduced with permission from REF. 25 © (1979) Springer Verlag.

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