Germination of Forest Trees a7) 
II species show a longer germination period in the shade than 
in the light. The other three species did not germinate suffi- 
ciently to make a conclusion possible. 
TABE RSE 
Tue Errect or Light on GERMINATION 
Eastern Species 
Open Light Medium Shade Dense Shade 
Beccles Began,| Period, Fine), Began,| Period, Eel, Began,| Period,| Pinal; 
Days | Days | Cent | Days | Days | Gent | Days | Days | Cent 
IPUNUSSIVOUUS! = = 525 e 22 50 TOW |) LO Sal |) Wits || uA 26 8.0 
Pinus divaricata....... I2 BA || RAL || LO AS || Oo || UO 38 TBS 
Pinus divaricata (F.S.)| 14 DO) |) 2X0)a5) |) seal AS) || B70) || 310) 24 | 46.5 
PUMUSH.ESTNOS One) ye 24 16 | 30.5 16 DA e500) ||) LA! 14 74.5 
IPG BAS POWISTUS 6 66.0666 Bit 53 10.5 | 32 82 1Q@ || 32 62 5.5 
IZUUS WIGS 6 be boc a6 34 OQ || 1@.@ |) BA © | 33.0 |) Be 8 | 33.0 
Abies balsamea....... 18 30 II.o | 18 38 10.0 | 18 36 8.0 
Catalpa speciosa....... 18 I TC) (0) (6) 0.0 | 16 I I.0 
Catalpa speciosa (Neb.)| 16 U2) |) Oe) |) aA 20 |92.0| 14 14 | 88.0 
Quercus rubra......... 40 28 28.0 | 30 18 UDO) || AAS) 42 12.0 
Robinia pseudacacia... 8 16 28.8 6 18 29.0 6 18 33-5 
Betula papyrifera...... 34 I TAO || Bal it 2.0| 34 I I.0 
ANGEYIUOVINTIU ee eee 18 30 BLO) || 1G 34 I5.0 | 14 34 16.0 
Gleditschia triacanthos . to) @ He Oo) 6 2 2.0 6 2 2.0 
Three species had a higher germination per cent. in the open 
light than in either of the shade cultures. Four showed the 
highest per cent. in the medium light and six in the dense shade. 
The greatest difference was shown in the case of Pinus resinosa 
whose germination per cent. was almost two and one half times 
greater in the dense shade than in the open light culture. 
The germination curves of Pinus resinosa and of Pinus divari- 
cata are given on page 38. These are representative of the 
effect that light has upon germination. These curves show a 
greater germination per cent. in the dense shade culture, a more 
rapid rise of the germination curve in the dense shade and that 
germination begins sooner in the shade than it does in the light. 
