IOWA ACADEMY OF SCIENCE 
23 
25 years, sets of seed were tested for vitalit}^ The following results were 
obtained : 
Name of Seeds — Tested as Known in 1879 
5 yr. 
10 yr. 
15 yr. 
20 yr. 
25 yr. 
Amaranthiis retroflexus 
+ 
! 
+ 
+ 
+ 
Ambrosia artemisissfolia 
0 
0 
0 
i 0 
0 
Braasica nigra 
0 
+ 
“h 
+ 
Bromus secalinus 
0 
0 
0 
’ 0 
0 
Capsella Bursa-pastoris 
_u 
0 
+ 
i + 
+ 
Erechthites hieracifolia 
b 
0 
0 
! 0 
0 
Euphorbia maculata 
0 
0 
0 
1 0 
0 
Lepidium virginicum 
+ 
+ 
-}- 
! + 
+ 
Lychnis Githago 
0 
0 
0 
! 0 
0 
Maruta Cotula 
+ 
+ 
+ 
i 0 
+ 
Malva rotundifolia 
+ 
0 
0 
i + 
0 
Oenothera biennis 
+ 
+ 
+ 
+ 
+ 
Plantago major • 
0 
0 
+ 
! 0 
0 
Polygonium Hydropiper . 
0 
+ 
+ 
+ 
+ 
Portulaca oleracea 
0 
+ 
4" 
+ 
+ 
Quercus rubra 
0 
0 
0 
0 
0 
Rumex crispus 
+ 
7 
+ 
+ 
+ 
Setaria glauca 
+ 
+ 
+ 
0 
+ 
Stellaria media 
+ 
+ 
+ 
+ 
+ 
Thuja occidentalis 
0 
0 
0 
0 
0 
Trifolium repens 
0 
0 
0 
0 
0 
Verbascum Thapsus 
+ 
•? 
+ 
+ 
0 
It was found that 8 out of 22 failed to germinate. All the acorns 
which were not placed in bottles were dead in two years. 
Prof. L. K. Waldron^' records some valuable experiments with buried 
seed of seven different common weeds. 
In fail of 1889, these were planted in a seed-bed out of doors at depths 
of 1, 2, 3, 4, 5, 7 and 10 inches. 
During the same fall Shepherd’s Purse produced a few plants at 
depth of 1 and 2 inches ; French weed 25 plants at 1 inch ; wild mustard 
many plants at 1, 2, and 3 inches; wild oats several plants at 1, 2 and 
3 inches. 
During 1900 the seeds continued to germinate and it was true of them 
that the small weed seed did not come up through 2 inches of soil; 
no seeds buried below 3 inches germinated except Kinghead or Great 
Kagweed and wild oats, which came up through 5 inches of soil. 
These data were furnished for the following weeds: Shepherd’s Purse, 
Frenchweed, Green Foxtail, Kinghead, Wild Mustard, Wild Buckwheat, 
Wild Oats. 
62, N. Dak. Evp. Sta., p. 439-445., 
