1921] HARRINGTON—GERMINATION 341 
tures warmer than 22.5°C. as at cooler temperatures. Four of 
these, candytuft, pink, portulaca, and zinnia, germinated somewhat 
less completely at 30° than at 25° or 28°C. Seeds of balsam, 
California poppy, candytuft, cosmos, cypress, mignonette, pink, 
portulaca, sweet pea, and zinnia germinated as completely with 
one or both of the warm temperature alternations, 20°—35° an 
20°-37° C., as with cooler temperatures. 
TABLE II 
GERMINATION, OF SEEDS AT DIFFERENT TEMPERATURES 
AVERAGE PERCENTAGES OF GERMINATION 
‘Thnrenaviie LARKSPUR Basho * Pansy Poppy SNAPDRAGON 
2 4 Ig12 19I4 
(rot) | (3 lots) | (2 lots) | (rlot) | (Tot) | (3 lots) | (8 lots) | (rlot) | (s lots) 
eC 53 BO ly Sos a errs ae 2 te 3 
ie Cc A RUS Caneel: 81 eee ae a ee RE {ey Damages 66 
TFS ones cece e ne 67 63 ode Waban 87 oF po ie ee 67 
ee On oe 48 28 74 46 78 70 60 48 62 
Doe oe OO Ses LS ESS Peay CR Re 59 
20-28" Uo faa, BA Aeiec ache cee. ee ae ae HO isa as 440 [2 as 
caidas WU acre nore ce Faded Wem g(t Bis He 48 ess ON ec. RA Loy 
(cooled rapidly) 
) ° 
BO BL veces ec ene BO ec oe ee ves ee ds ees 
2030 ose enee es 25 8 65 56 74 66 52 46 52 
BO 32 vere vee e ee vs ee es Role: AS |eveses det Eee ee Pee 
SO TSO Ue ee haw nls eee lines ees 4B lives Pee EES Gar) ae a ares 
(cooled slowly) 
BOTST tv ene ve ues Been POMC, U8 Saas Fe AA uc Gs OE ee ie 
Phos ss o'4 5 ok Ee gabe Be gen COO OR le, ele ieee ie 
gh Os Ses erase bo SE > Oe Sar oo he. Cae ena 
BO ake Cuca es dee Paha Cie Geer Pi ed ee We Bere 19 
Seeds of larkspur, nasturtium (2 species, 1 sample each), pansy, 
poppy (a number of species), and snapdragon belong to group 2, 
which germinated most completely at a temperature cooler than 
20°C. In 1914 the larkspur, poppy, and snapdragon seeds were 
tested in an icebox in which the average temperature was about 
8° C., as well as with the temperature conditions used with the 
other kinds of seed. 
Table II shows the average percentages of germination of seeds 
of group 2 under the different temperature conditions, arranged 
in the order of increasing average temperature of the germination 
