1921] GARDNER—GERMINATION 273 
of sulphuric acid appear only in the germination of seeds of Daucus 
Carota in darkness. Soaking seeds of Nicotiana Tabacum and 
TABLE XVA 
Licutr | DARKNESS 
SEEDs N | orN |o.o1rN fore) | N or N 0.08 | 0° 
Hydrochloric acid (soaked 26 hours) 
2 70 70 65 16 35 22 II 
Verbascum Thapsus. .... 34 85 87 85 I 22 24 3 
Daucus Carota.......... ) oO ° 5 ° 18 25 19 
Oenothera biennis....... 76 92 87 78 87 ene ea 8 
Rumex crispus....,..... 80 OS Ey ae eee 35 35 15 
Nicotiana Tabacum...... 83 
Nicotiana Tabacum......|...... 76 76 a ola aught ce Io 26 ar 
Verbascum Thapsus.....|...... 79 87 Bie ens a 10 ° 
erences Carote.. 0.0... re 66 ie tee 12 38 ar 
Oenothera biennis.......|...... 83 51 2 ee En 10 8 
Water chiar scp 4 69 73 ae eae 24 30 31 
Nicotiana Tabacum...... GS tie 74 as Beagle, Tapa oes 19 
Verbascum Thapsus.....} 57 |....../.....- 83 fee (aes Pee rc 5 
Daucus Carota.......... 6. i vhs $20 a 26 
Oenothera biennis....... yaa ea) eee 52 SLi: 12 
Rumex crispus.......... PO Ey Phas gee eee 68 Reo Lior acstrcee sd 24 
Sodium hydroxide (soaked 24 hours) 
Nicotiana Tabacum...... Od: Be [bt] o ) 26 1} at 
Verbascum Thapsus..... eo} 6 86 | 83 ° ¥o | 39 5 
aucus Carota.......... ° 77 63 75 ° 30 45 26 
Oenothera biennis. .. . . I 87 42 51 ° 22 12 12 
Rumex Pus. etc ° 59 76 68 ° 17 26 24 
TABLE XVB 
PERCENTAGE OF HYDROGEN PEROXIDE (SOAKED 27 HOURS) 
= Light | Darkness 
: 50 | 20] Io 5 | oo | s0 | 20 | ro] § | fore) 
' Nicotiana Tabacum............. 15 | 75 | 72| 56] 74] 6| 38] 81 | 46 | 19 
Verbascum SOAR ccs se 12| 70| 75 | 68 | 83; of o| 6] 2] § 
Daucns Catota oo 76 | 83 | 94 | 78 | 75 | 26 | 48 | 61 | 53 | 26 
* Oenothera biennis..........:...| 18 33 | 33 | 40| 53 { O| 5 | 12} 10] 12 
Rumex crispus............:....| 73 | 66 | 73 | 77 | 68| 43 | 36| 70| 39 | 24 
Re 
