CONTENTS. 7 



Tlio T.ohlolly Pinn (Phiim titda lann). By CllARLES MoilR, I'll. D. — Continueil. Pago. 



Natural reproduction 123 



Conclusion 124 



The Spruce Pine (/'»««« ijlahra Walter). By Chaules Moms, Ph. D 125 



Introductory 127 



Historical 127 



Distribution 127 



Econoiuic importance 127 



Botanical description 128 



Progress of development 129 



Enemies 130 



Requirements of development 130 



Notes on the structure of the wood of the five pines, Pinus palualrix, lieterophylla, echinata, tieda, and glabra. By 



I FlI.IllEUT ROTII 131 



Sap and heart wood 133 



Annual rings 134 



Spring and summer wood 136 



Grain of the wood 1.38 



Minute anatomy 138 



