VIII DEPARTMENT OF AGRICULTURE BULS. 276-300. 



Department Bulletin No. 299 — Continued. Page. 



Species for timber growing. 39 



Natural v. artificial reforestation 40 



Reforesting by natural means • 41 



Reforesting by artificial means 44 



Thinnings 48 



Summary 51 



Department Bulletin No. 300. — Excavating Machinery Used in Land 

 Drainage: 



Introduction 1 



Development of excavating machinery 2 



The floating dipper dredge 3 



The floating grab-bucket dredge 17 



The drag-line scraper excavator 18 



The dry -land dipper excavator 25 



The dry-land grab-bucket excavator 28 



The templet excavator 28 



The wheel type of excavator 30 



The hydraulic dredge 33 



Machines for cleaning old ditches 35 



Summary 37 



