CHAP. XIII.] 



UNION OF DIGITS : MAN. 



357 



Before going further certain points are to be noted. First, the 

 union as shewn in the figures is a union or compounding as of optical 



I 



D 



IV 



Fig. 104. Cases of syndactylism. I, II and III. A progressive series illus- 

 trating degrees in the union of medius and annularis in the hand. IV. Case of 

 union of index and medius of the foot. The union is incomplete peripherally. 



(After Axxandale.) 



images in Bilateral Series, and is not like that of parts in Succc»m\ <■ 

 Series. Next, the union of the bones is more complete /» rxphi rally and 

 less complete centrally. The latter is a rule very commonly observed in 

 cases of the union of the bones of digits both in Man ami other mam- 

 mals. This statement is made without prejudice to the other let that 

 in the least state of syndactylism as manifested by union of the Bofl 

 parts, it is the most central phalanges which are united. Such a case 

 of partial union between II and T FT in the foot' is shewn in Pig. 1" 1. I V 

 (Axnaxdale, /. c, fig. 34). The rule that in the Lowest condition o! 

 syndactylism of the bones it is commonly at the periphery thai the 

 union is most complete is also difficult bo understand in connexion with 



1 Compare several remarkable cases of this variation in one family, lb Clkbo, 

 M€m. hoc. Linn. Normandie, ix. p. xxvi. 



