Abstract

References
1.
Flandin
, Journ. de Méd. et de Chir. , 1921 , xcii , 441 .
2.
Solis-Cohen
S.
, Journ. of Immunology , 1918 , iii , 261 ;
3.
id., Journ. Exper. Path. , 1927 , viii , 149 .
4.
Cronin
Lowe
, Brit. Dent. Journ. , 1928 , xlix , 457 .
5.
id., Brit. Med. Journ. , July, 1928 (ii ), 98 .
6.ibid , July, 1929 (ii ), 43 .
