430 BOTANICAL GAZETTE [JUNE 
changes in the permeability of the seed coat. It is certainly not 
a matter of embryo changes. 
TABLE II 
GERMINATION OF TREATED AND UNTREATED LETTUCE SEED 
GERMINATION 
DURATION OF Ries Ra eee a ee 
VARIETY 
TEST IN DAYS M ; 
Tatteated apace — roars - ae 
Black-seeded butter— 
POON Gare eee t2 OO ee ec ee eee eee 
IOIOM pa te 12 GO See as seal hata ae 
de BO et ea oy Lee gs I2 890 93 95 
LD ebiaronsligas emiare cla Gee 12 67 97 too 
Prize fees 
Pte a ia cte ue are use arcs 12 98 sealers 2 sea una Polat eee le 
sie Ne a ea re 12 Off eevee eee A Sere ee ee 
TORT a hea 12 84 96 97 
RGR ey os ie eee 12 76 98 96 
It appears, from a study of the records kept in this work, that 
not only the total germination, but also the rapidity or energy of 
germination is greater in treated than in untreated seeds. This is 
shown in table ITI. 
TABLE III 
RAPIDITY OF GERMINATION OF TREATED AND UNTREATED SEEDS* 
Kind of seed Germination after Untreated Treated 
ne ea MAD are 
econo Ce Neh eRN ee San 3 days 48 98 
WWE et 40% 69 89 
Perenvial peas... os ge ON, PRs ° 33 
PUeeUmial PERS. an 24 80 
oe AE ee ard MERE ier ce Ae 4 40 88 
PPDOINN a ees 4 44 
REL OAS Ce a ee a fe) Y he. 
Swhet Cele. 0 at eC 16 86 
Pcs ee ee epee 
* For final germination percentage of these samples see table I. 
Such rapidity of germination would clearly be of advantage in 
making the crop uniform in size and age, and in keeping down 
weeds. Indeed, it may be said truly that vigor of germination 
and vigor of the plants produced are more important than merely 
high germination percentage. Plants that get a good strong start 
