C. Dobell 
163 
The “coccidia" found in the skin in Darier's disease (“psorospermosis 
follicularis vegetans”), in Paget’s disease of the nipple, and in other affections, 
by Darier (1889) and others, are now generally recognized as modified epi¬ 
dermal cells (cf. Boeck (1891), etc.). The “coccidiaof molluscum conlagiosum 
are probably of a similar nature 1 . These and similar diseases, once included 
among the “ psorospermoses,’ - have long ceased to be regarded as the results 
of coccidial infection. 
In the preceding paragraphs I have enumerated all the cases of human 
coccidiosis which, so far as I have been able to ascertain, had been put on 
record prior to the year 1915. I have omitted to consider in detail those cases 
only which, by general consent, have already been finally consigned to oblivion. 
It will be convenient at this point, before going further, to summarize briefly 
the main conclusions which may be drawn from a study of these cases. I will 
therefore do so: but I would point out that these conclusions are drawn 
entirely from the facts recorded by the original describers of the various 
organisms concerned, and independently of the opinions of later commentators 
which will be considered in the next section. 
(1) There is good evidence that at least nine of the authors who have 
described, or who are alleged to have described, coccidia from man, did not, 
in fact, do so. The organisms or structures which they found were certainly 
not coccidia. These authors are: Virchow (1860), Rivolta (1873, 1878), Grassi 
(1879), Podwyssozki (1889), Giles (1890), Jurgens (1895), Quincke (1899), 
Thomas (1899), Grunow (1901). The cases of human coccidiosis attributed to 
these workers should therefore be eliminated from the literature of the subject. 
To this index expurgatorius must also be added, of course, the names of all 
the describers of “pseudo-coccidia"; and for my own part, I am disposed to 
add also the names of Kunstler and Pitres (1884). Despite the authority of 
Blanchard, I cannot regard theirs as anything but a most questionable case of 
coccidiosis. 
(2) This leaves us with only six works which record cases of infection with 
organisms that can be regarded, with different degrees of certainty, as coccidia. 
The parasites were recorded from the liver, intestine, or faeces, as shown in 
the following synopsis: 
In the liver, by 
Gubler (1858). . 1 case 
Dressier [recorded by Leuckart (1863, 1879)] ... ... 1 ,, 
Sattler and Peris [recorded by Leuckart (1879)] ... ... 1 ,, 
Peris and v. Sommerring (?) [recorded by Leuckart (1879)] 1 ,, 
Silcock (1890). 1 „ 
Carried forward 
1 For the literature see Labbe (1899) and Lipschiitz (1912). 
5 cases 
