406 



Once in a male 6 months old. 



Once in a female 12 months old. 



Once in a male 5 years old. 



Once in a female 27 years old. 



This gives me a percentage in adults of 1^/q for type one, which 

 thus closely approaches Treves' figures. 



Type two in my series is constituted as follows: 



Once in a female aged 3 years. 

 Once in a male aged 2 years. 

 Once in a male aged 6 months. 

 Once in a male aged 2 years. 

 Once in a male aged 35 years. 

 Once in a female aged 78 years. 



For adults then this gives me a percentage of 2 as against 

 Tbeves 3 Vo. 



With regard to type four, I find my series was thus composed: 



Once in a female aged 40 years. 

 Once in a male aged 49 years. 

 Once in a female aged 60 years. 

 Once in a male aged 2^/3 years. 



Confining the percentages to adults then, and placing my revised 

 table alongside Treves' we find a striking similarity thus: 



Treves Beret 



Type one 2 «/„ Type one 1 »/„ 



Type two 3 „ Type two 2 „ 



Type three 91 „ Type three 94 „ 



Type four 4 „ Type four 3 „ 



These two tables illustrate the enormous preponderance of type 

 three in adults, — in that very class where operations for appendicitis 

 are most frequent. 



Sex apparently makes little difference, as I found type three 

 49 times in males and 31 times in females. 



The importance of the frequency of these types of caeca to the 

 surgeon is as follows: 



As the types of caeca are practically based upon the relation of 

 the true apex of the caecum, or in other words the base of the vermi- 

 form appendix to the ileo-caecal junction, and as type three is in an 

 overwhelming majority, it follows that the base of the appendix will 

 bear, in about 90% of adult cases, a certain definite relationship to 

 the ileo-caecal junction. A knowledge of that relationship is of ma- 



