TEGUMENTAL ORGANS 5 
sixth month, the whole body of the embryo, except the surface 
of the hands and feet, the red edges of the lips, the glans penis 
and clitoridis, and the inner surface of the foreskin, is covered 
with abundant soft woolly hair (lanugo).' 
In certain parts of the body the hairs are arranged closely 
and quite regularly in tracts, just as birds’ feathers are arranged 
in the so-called “ pterylw.” These hair-tracts (Fig. 2) are vortex- 
like in arrangement, diverging over some areas, cour Tae over 
others. 
In the former (cf. the hair of the head) the hairs point with 
their free ends outwards, from the vertex as a centre ; in the latter, 
on the other hand, the direction of the hairs is the reverse of this, 
their free ends being directed inwards, 2.c. towards the centre of 
the vortex. This latter, converging, disposition is only found, both 
in the lower Mammals and in Man, at parts where an organ either 
projects during life, as in the case of horns and antlers, or has pro- 
jected at some period in ontogenetic or phylogenetic development. 
An excellent example of this is afforded by the radial 
arrangement of hairs often found in the male sex in the region 
of the navel, or still better by the “vertex coccygeus” (Fig. 3) 
described by Ecker. The position of this latter exactly corre- 
sponds in the embryo with the point at which, before the bending 
of the os sacrum took place, the extremity of the coccyx pushed 
against the skin; ¢.e. with the point where the coccyx formerly 
projected as a free tail, the cauda humana (cf. pp. 27, 28). 
Just before birth the position of the vertex coccygeus shifts, 
a hairless area being developed (Glabella coccygea) which may 
sink in to form a pit (Foveola coccygea, fv, Fig. 4) (Ecker). On 
the other hand it frequently attains such a dence of development, 
deutschen) and of Holland (Niederdeutschen), I am convinced that ‘‘on his toes” 
(Zehen) is the right version of the proverb, and not ‘‘on his teeth” (Zahnen). 
Many similar perversions of old popular sayings, or of words of which the original 
meaning has gradually been lost in later generations, are to be found ; for instance, 
the expression ‘‘to have his sheep (Schaffchen) in the dry ” originated on the coast, 
where ‘“‘to have his ship (Schiffehen) in the dry” is still heard. Again, the 
Schonberg near Freiburg was originally called Schynberg, from Schyn, which means 
a witch, a word which has been retained in the ‘‘ Witch’s Valley ” at the foot of this 
hill, and in the Swabian term of contempt ‘‘Schyn-Aas”’ (literally witch carcase). 
' Tn the fourth or fifth month the human embryo has a distinct stratum corneum 
with an epidermal layer outside it, which corresponds with the epitrichium of Rep- 
tiles and of many Mammalian embryos (Edentata, Dicotyles, Sus, and others). After 
the sixth month of embryonic life the latter disappears from most parts of the body. 
The epitrichial layer covers the hairs and the glands, being able to some extent to 
keep back the secretions of the latter. In this way it provides for the accumulation 
of a rich secretory deposit, the so-called ‘‘ vernix caseosa.”’ 
