(Chapter 12) Footnote 86:

The apologetic tone of the Lat. h quodammodo . . . insignitum, “marked with some kind of eta” or “marked after a fashion with an eta,” suggests that Vesalius wrote with the finished woodcut before him in which the Greek letter is poorly represented, looking too much like a Greek minuscule k or a roman H. This was a serious problem with the Greek letterforms used in both editions, where h and k are nearly indistinguishable from each other.