H. S. Stannus 
349 
is to say, a case with small areas of skin, congenitally deficient in pigmentation, 
but not completely albinotic. Secondly, the case demonstrates, I believe, a pre- 
viously unrecorded condition, a partial and incomplete albinism of the iris ; it is 
noteworthy also that the condition only affects one side, in fact the area on the 
face is strictly limited to the one side by the mid-line of the nose. This case 
will be mentioned again later. 
In speaking of the other two cases I am not quite so sure of my ground. 
The girl " I." presents no definite pink area of skin, but a condition resembling 
very much that described as Ziemann's leucoderma. It is said to have been 
present at birth, and the similar condition of fingers in the girl "H." supports 
the probability of this statement being true. The history that the condition is 
not changing is against leucoderma and therefore, on the whole, I am inclined 
to include it as a case of spotting. 
(B) The special group of partial albinos characterised by an affection of the 
glans penis must now be considered. 
My attention having been drawn to the point, the condition was then sought 
for among a number of adult men aged from 20 — 50, and including circumcised 
and uncircumcised, those with a partly retracted prepuce and those with a long 
covering. More or less complete circumcision is practised among the Mohammedan 
Yaos, but not among other tribes. 
At the outset one must recognise that, just as in Europeans so in natives 
of Africa, there is very considerable variation in colour of the glans penis and 
inner surface of the prepuce, colour conditions which are fairly comparable to 
those of the mucous membranes. Just as in Europeans, variations from a 
delicate pink to the colour of uncooked lean bacon, from almost white to 
a purple red, occur ; a similar variability is seen in uncircumcised natives, but 
always in the darker hues, that is, the skin in this situation always contains 
some pigment. 
Dr Stachan, quoted by Pearson, states that the glans penis beneath a 
phimosed prepuce is always red ; I am not quite sure whether he wishes to 
infer that the skin is devoid of pigment or not, but certainly the latter condition 
is the truth. 
In the circumcised, the glans is practically always of the same hue as the 
rest of the penis and scrotum, i.e. a darker tint than the general colouring of 
the body. 
In the uncircumcised, as a rule, according to the extent of the natural 
uncovering of the glaus so is the degree of pigmentation. 
The portion of glans normally uncovered by a naturally partially retracted 
prepuce is often darkly pigmented, shading off to red as the corona is reached; 
sometimes the general colour is a dark lean bacon-red, it may be with a purplish 
hue ; in others, the general colour of the glans is an opaque leaden white. In 
Biometrika ix 45 
