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THE POPULAR SCIENCE MONTHLY 



method of inheritance differs in the case of normal and abnormal char- 

 acters, but rather that abnormal characters are more striking, more 

 easily followed from generation to generation, and consequently statis- 

 tistics are more complete with regard to them than in the case of nor- 

 mal characters. In many cases statistics are not sufficiently complete 

 to determine with certainty whether the character in question is domi- 

 nant or recessive, and it must be understood that in some instances the 

 classification in this respect is tentative. A partial list of these char- 

 acters is given herewith : 



Mendelian Inheritance in Man 

 normal characters 



TERATOLOGICAL AND PATHOLOGICAL CHARACTERS 



General Size: 



Achondroplasy (dwarfs with short Normal. 



stout limbs but with bodies and 



heads of normal size). 

 Normal size. 



Hands and Feet: 



Brachydactyly (short fingers and 



toes). 

 Syndactyly (webbed fingers and 



toes). 



Polydactyly (supernumerary digits). 

 Skin : 



Keratosis (thickening of epider- 

 mis). 



Epidermolysis (excessive formation 

 of blisters). 



True Dwarfs (with all parts of the 

 body reduced in proportion). 



Normal. 



Normal. 



Normal. 



Normal. 



Normal. 



