890 H. H. NEWMAN AND J. THOMAS PATTERSON 
In this set the following points are noteworthy: 
1. In none of the specimens examined in the statistical study 
of the frequency and distribution of double scutes was a case of 
doubling found in the last scapular row; hence the likelihood of 
the conditions described being due to coincidence is extremely 
remote. 
2. The location of the double scute is evidently not so rigidly 
defined as in the former case, since the double scute in foetus 
11z is rather far separated in position from that of either of the 
other foetuses. In the two individuals of the natural pair A, 
of the left hand side (right in the figure), however, the position 
of the double scute is almost precisely the same. One can detect 
the difference in position only by counting the scutes. Careful 
examination of the two right hand individuals in fig. 24 will make 
this clear. In the subsequent discussion of the phenomenon of 
pairing this circumstance will receive further attention. 
3. It is very unusual, as was indicated in the general discussion 
of scute ‘abnormalities,’ for an individual to have more than one 
double scute. When, therefore, three of the four quadruplets 
have two or more double scutes and the other has one we are 
inclined to suspect that they are all predetermined. 
4. In this and the last set the ‘three-to-one’ proportion is shown 
in several ways: (a) In set 121 three show a double scute and” 
one lacks it; (b) in set 123 three have the scapular double scute 
and one lacks it; (c) in the same set one of the four has three 
double scutes, one has only one double scute, and one of the four 
has an incomplete scute in place of a double scute. Many other 
cases of a similar kind are noted in connection with both normal 
and atypical sets. 
The following points although possibly of no real significance 
should be noted: (a) In foetus tv, the adjacent of foetus 1, occurs 
a double scute in the same position in its band as that which occurs 
in the scapular region of foetus 1, but four bands posterior to the 
latter. (b) In foetus 11 occurs an incomplete scute occupying 
the same position in its band as does one of the double scutes of 
foetus 1, but situated four bands posterior to the latter. (c) 
Tn foetus 111 a double scute of the sixth band is in position almost 
