Fourth International Congress on School Hygiene
3, 657 Head Lice . ... diagrams. show. the. number. and. percentage. of children defective at each age period from 6 to 16 inclusive:* Age Normals Percentage Defectives Percentage 6 9, 028 2.9 24, 957 8.2 7 7, 057 2.3 26, 122 8.6 8 6, 591 2.2 anbsp;...
| Title | : | Fourth International Congress on School Hygiene |
| Author | : | |
| Publisher | : | - 1914 |
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