6 



r.ri .i.ktin (i")S, r. s. hkpaktmkxt of agriculture. 



surveyed, and along with careful notes of the estimator upon the 

 diseased areas and upon data secured by means of a few small sample 



Fig. 5. — Polyporus schioeinitzii, the velvet-top fungus. 



plats a very close 

 estimate of the cull 

 percentage to be ex- 

 pected can be had. 

 Checks can be made 

 upon the estimator's 

 work by the expert 

 cruiser. Members 

 of the Office of In- 

 vestigations in For- 

 est Pathology can 

 render excellent 

 service by aiding 

 each unit crew in 

 the field in becom- 

 ing familiar with, 

 the various diseases 

 and their causes. 



If properly ad- 

 justed, this work 

 would cause no va- 

 riations in the amount of line run per day by the unit crews. The junior 



Fig. 6. — Typical rot of the velvet-top fungus in the end of a 

 white-pine log. Note the cubical character of the rot. 



