














894 The American Naturalist. [October, 
The movements are supple and graceful. When one walks the 
other does not have to walk backwards. Progression takes place 
in many ways that would take too long to describe here. Ordi- 
narily, as with Millie-Christine, the two internal feet advance 
together, then the two external ones. Rosa-Josepha can walk, 
each by herself, the one carrying the other. The walker throws 
herself a little in advance, the one who is carried resting on the 
other’s hip, having only to lift her feet a little from the ground. 
Sometimes they walk on three legs, or even two, going up stair- 
ways, and practicing the dancing lesson which is given them every 
day. 
The pathological history of their pygopage would be very 
interesting if it could be exactly known. It is on record that one 
of the children was sick, when a year old, with croup which the 
other did not have. Shortly after the well individual was seized 
with convulsions, which did not attack the one which had had | 
the croup. = 
The case of Rosa-Josepha is not entirely analogous and com- ; 
parable to the two other pygopages, Helen-Judith and Millie- 
Christine. The former, who has disappeared from public view 
since 1874, had the spinal cords united, but in Rosa-Josepha this 
does not seem to be the case. In other respects these two girls 
resemble Helen-Judith, and they probably constitute a type inter- 
mediate between the latter and Millie-Christine. 



