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Fig. 1.— Map showing the gradual spread and distribution of tlie Brown-Tail 

 Moth in New Hampshire. Dotted area infested in 1906. Heavy lines indicate 

 outer boundaries of areas infested in years indicated at margin. Dash lines 

 represent approximate boundaries not personally investigated, based on 

 points infested north of these points. Black circles show points examined in 

 January, 1906, and found uninfested. 



