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. — Carina, Cliantkus 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 Wrightii, 

 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, Aqui- 

 legia, Asparagus Sprengeri, Bignonia, Centaurea, Clematis, dande- 

 lion, Datura Golden Queen, Eschscholzia, foxglove, heliotrope, 

 Helianthus, hop, lavender, Momordica, Nasturtium, Oenothera, 

 pansy, Pcntstemon, Primula, Salvia, Verbena, Abies Mertensiana, 

 A. pectinata, Berberis, Betula alba. Cupressus horizontal'^, C. macro- 

 carpa, C. pwamidalis, Lari.v. 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 191 1 (Oswald 23). Of field seeds 

 14 kinds were tested; of garden seeds 26 kinds. Of field seeds, for 



