6 MALL. [Vo.t. XTX. 
possible, and in general have adopted Ballantyne’s classifica- 
tion, which, in turn, is based upon Tarufh’s. 
I wish it were possible to thank adequately the many 
physicians who have contributed the specimens and who have 
responded so generously to my many inquiries. All data 
obtained from them are given in quotations under the descrip- 
tion of the specimens, which are also properly credited to the 
donors. Some names will be seen repeatedly, as Miller, 
Boldt, Lamb, Brodel, Ballard, West and Minot. In addition, 
I wish also to thank my colleagues at the Johns Hopkins, 
who have aided me in every possible way to bring together 
the gynecological, obstetrical, pathological and experimental 
embryological evidence. 
In this paper all of the embryos mentioned in the two pre- 
vious ones are discussed, and brought together in Part Il. 
The essence of the first contribution is given, and all of the 
second contribution is incorporated in this publication, so in 
a measure it may be viewed as a study of the whole collec- 
tion. However, the various steps by which I came to arrange 
the specimens, as I have, can be understood only by consulting 
the two previous publications. 
III, which was to be the important part, never appeared. Fortunately, 
however, Ahlfeld’s library, which is very complete, was presented to the 
Johns Hopkins University. This I have consulted freely and in a way 
it makes up for the missing Part III. 
Marchand, Missbildungen, Eulenburg’s Real-Encyclopedia, 3d edition, 
1897, Vol. XV. 
Taruffi, Storia delli Teratologia, 8 volumes, Bologna, 1881-1895. 
Hirst and Piersol, Human Monsters, Philadelphia. 
Piersol, Teratology, Ref. Hndbk. Med. Sci., new edition, Vol. VII, 
1904. 
Ballantyne, Antenatal Pathology, 2 volumes, Edinburgh, 1904. 
FE. Schwalbe, Die Morphologie d. Missbildungen des Menschen und 
der Thiere, Jena, Pt. I, 1906, Pt. II, 1907. 
