148 MILK AND THE PUBLIC HEALTH CHAP. 



Combined Tabulation, Cases reported including their own 

 series of Cases. 



Mixed or double infections, 4 cases. 

 Total cases = 1042. 



This table shows that the bovine type of bacillus was 

 found in only 1*3 per cent of the adults, but in 25*0 per cent 

 of the children 5 to 16 years, and in 26'7 per cent of the 

 children under 5 years of age. When the phthisis cases are 

 excluded, the adult percentage rises to 7*3. 



These investigations and figures (and others which limits 

 of space forbid quoting) show that while pulmonary tubercu- 

 losis is almost invariably of human origin, a considerable pro- 

 portion of the cases of other varieties of tuberculosis, especially 

 glandular and intestinal infections in children, are infected 

 with bacilli of bovine type, and derived from bovine sources. 

 It is not possible to determine with any precision the exact 



