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( 3 ) THE INFECTINGr (“ ENCYSTED”) STAGE OF THE LARVA. 
Dlswfection of 2?reniise8. — A chemical disinfection of premises to 
kill the free stages of eggs, emhrvos, and larvee of the parasite would 
hardly he practicable, but boat, dryness, and cold all result in killing 
these organisms. 
