CONTENTS. 



Page. 



History of the maple sugar industry 5 



Present status of the industry 5 



Past and present output of sugar and sirupr 7 



Sugar " mixers " and fabricators and their work 8 



Necessity for sugar makers' organizations 9 



Sugar maples 10 



The sugar maple 10 



The black maple 12 



The red maple 13 



The silver maple 13 



The Oregon maple 13 



Sugar groves . 14 



General considerations 14 



The improvement of a mature dense grove 16 



The improvement of a mature open grove 16 



The improvement of a dense young grove 18 



The management of a sapling thicket 20 



Situation of a sugar grove 23 



Planting a sugar grove 24 



Maple sap 25 



Sap pressure and flow 25 



The amount of sugar in maple sap 26 



The manufacture of sugar and sirup 26 



Improved methods 26- 



The sap season 27 



Preliminary preparations 28 



Tapping the trees and gathering the sap 28 



Depth of tap holes 30 



The equipment 31 



The process 32 



The prof i t 35 



252 



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