356 Report or THE HorricULTURAL DEPARTMENT OF THE 
germination is found. Correlated with a less storage of reserve 
material is a less vigorous germination. With many kinds of 
seed the lightest ones do not germinate at all or only sparingly. 
Most conspicuous is this last in the case of seeds enclosed in a 
firm seed coat, such as grape and solanaceous seeds. Many such 
are found to be lighter than water and are generally hollow. 
The ranges of specific gravity representing different vigors of 
germination may be mentioned for a few kinds of seed: 
In the case of grapes, germination is very rare below 1.07 to 
1.04 according to the variety. Over a range of several one-hun- 
dredths above these points germination is infrequent. In the 
case of several kinds of leguminous seeds examined, germination 
had not taken place below 1.18 or thereabouts. In the case of 
common field clover there was in one case no germination below 
1.17 and in a sample of crimson clover, known to be at least one 
and a half years old, there was no germination below 1.28. Wheat 
gave no germination below 1.18. Egg plants give very few ger- 
minations below 1.00 and perhaps these few germinable seeds 
could have been separated from the others by the use of a solu- 
tion slightly lighter than water. 
MUSTARD. 
Germination tests with mustard gave the results reported in 
the following table. The seeds were set in filter paper April 10 
and the first germinations observed April 138. 
TABLE V.—SHOWING CORRELATION BETWEEN SPECIFIC GRAVITY OF 
MusrarD SEED AND RAPIDITY AND PERCENTAGE OF GERMINA- 
TION. 
Germinated. Germinated. Germinated. | Germinated. 
Sp. gr. | No. of seeds.) “April 13, April 14. April 15. April 22. 
i 
HR 
AH AwOoOOnNrF 
eee te 
1 
1 
2 
1 
5 
5 
15. 
15 ile 
16. 
10 
3 
10 
NR hw h 
Prt pt fet et et et et et fet et et et 
xs 
re 
Bb Rt 
2. 
21 ie 
89. 43. uh ie thn Ue 
ae 
