438 BOTANICAL GAZETTE [JUNE 
very little or even none at all. Ten samples gave an average 
germination of 67 per cent with the coats on, and 74 per cent with 
the coats off, a difference of 7 per cent. Individual samples, such 
as Dwarf Defiance 874K, gave even more striking results. 
The condition of garden peas, with reference to fungi, is 
approached more or less closely by that of a large number of other 
garden and flower seeds as is shown in table IX, summarizing the 
general results of this investigation, and in the discussion following. 
Plants whose seeds show delayed germination, classified accord- 
ing to probable causes (the word “probable” is used advisedly, 
for while the evidence is convincing in some cases, it is much less 
so in others): 
1. Hard-coatedness.—Canna, Clianthus Dampieri, Delphinium, 
Erythrina, Hibiscus, Ipomoea (4 spp.), Lathryus, Lupinus, sweet 
peas (4 vars.), snapdragon, alfalfa, sweet clover, white clover, 
lettuce (10 vars.), mustard (2 vars.), okra, sensitive plant, sweet 
marjoram, vetch, Gleditschia. 
2. Frosted.—Oats, peas (8 vars.). 
3. Need of after-ripening—Wild cucumber, Picea (3 spp-), 
Pinus (2 spp.). 
4. Exclusion of oxygen by the seed coat.—Datura Wrighti, 
Martynia. 
5. Cause of delay not determined.—Coix Lachryma, feather 
grass, Pampas grass, asparagus, barley, blue grass, cardoon, celery, 
chives, dill, horehound, kaffir corn, leek, millet, parsley, parsnip, 
pepper, radish, rosemary, spinach, summer savory, thyme, Aqu- 
legia, Asparagus Sprengeri, Bignonia, Centaurea, Clematis, dande- 
lion, Datura Golden Queen, Eschscholzia, foxglove, heliotrope, 
Helianthus, hop, lavender, Momordica, Nasturtium, Oenothera, 
pansy, Pentstemon, Primula, Salvia, Verbena, Abies Mertensiana, 
A. pectinata, Berberis, Betula alba, Cupressus horizontalis, C. macro- 
carpa, C. pyramidalis, Larix. Further work would doubtless 
explain the cause of delay in many of these seeds and make the 
growing of plants from them a much simpler matter than it now is. 
Very pertinent at this point are the results from the Minnesota 
Seed Laboratory for 1910 and 1911 (OswaLp 23). Of field seeds 
14 kinds were tested; of garden seeds 26 kinds. Of field seeds, for 
