HOW THE SEEDS WERE BURIED. 



Table I. — List of seeds selected for the experiments — Continued. 



Labora- 

 tory 

 test 

 num- 

 ber. 



16247 



16248 

 16249 



16250 



16251 



16252 I 



16253 , 

 16254 



16255 

 16256 



16257 

 16258 



16259 

 16260 

 16261 



16262 



16263 

 16264 

 16265 



16266 

 16267 

 16268 



16269 

 16270 



16271 



16272 

 16273 

 16274 



16275 



lr._'7>. 



16277 

 16278 

 16279 

 16280 



162-1 

 282 



-■ 



- 



Kind of seed. 



Hyperieacese (St. John's wort family): 



Ascyrum hyperieoides L. (St. Andrew's cross) 



Onagraeea? (evening primrose family): 



Onagra biennis (,L.) Seop. (common evening primrose) 



Apiaeeae (carrot family): 



Apium grareokns L. (celery) 



Pastinaca sativa L. (parsnip, wild) 



Oleacea? (olive family): 



Fraxin us amcrieana L. (white ash) 



Convolvulacere (morning-glory family): 



Convolvulus septum L. (hedge bindweed, great bindweed) 



Ipomoea lacunosa L. ( small-flowered white morning-glory) 



Cuseutacea? < dodder family) : 



Cuscuta palygonorum Engelm. (smartweed dodder) 



Cuscuta epilinum Weihe. (flax dodder) 



Verbenaee* (vervain family): 



Verbena hastata L. (blue vervain) 



Verbena urticifolia L. (white vervain, nettle-leaved vervain) 



Solanacea? (potato family): 



Capsicum annuum L. (red pepper) 



Datura (alula L. (purple stramonium, jimson weed) 



Lycopersicon lycopersicon i L. ) Karst. (tomato) 



Nicotiana tabaeum L. ( tobacco) 



Solan a in nigrum L. (black nightshade, garden nightshade) 



Scrophulariacea- itigwort family): 



Verbascum thapsus L. | great mullen) 



Plantaginacea- (plantain family): 



Flantago lanceolata L. (ribwort, ribgrass, buckhorn) 



Flanlago major L. < common plantain ) 



Plantago rugelii Dec. (Rugel's plantain, broad plantain) 



Cucurbitaceae (gourd family): 



CitruUus citrullus i L. i Karst. (watermelon) 



Cur a. in is melo L. (muskmelon ) 



Cucumis sativus L. (cucumber) 



Cichoriacese (chicory family): 



Lactuea scariola L. i prickly lettuce) 



Lactuca sativa L. ( lettuce ) 



Taraxacum trythrospermum Andrz. (red-seeded dandelion) 



Ambrosiaceae (ragweed family): 



Awbro.<ia artemisiaeJolUx L. I ragweed) 



Ambrosia, trifida L. | great ragweed I 



Xanthium pennsylvanicum Wallr. | Pennsylvania clotbur, cocklebur) 

 Asteraceae (aster family): 



Arctium lappa L. I burdock, clotbur i . ... 



Bidt nsfrondosa L. I black beggar ticks) ? 



fa chins orrr nsts ( L. | Robs, i Canada thistle) 



Chrysanthemum leucanthemum L. (whiteweed, oxeye daisy) 



Grindelia squarrosa (Pursh.) Dunal. (broad-leaved gum plant) 



Helianthus nun mis L. (common sunflower, wild) 



Helianthus a nun us L. (common sunflower, cultivated) 



Onopordon acanthium L. (cotton thistle, scotch thistle) 



Rudbeckia hirta L. | black-eyed Susan) 



Pinaceae | pine family) : 



Pinus ' irginiana Mill, (scrub pine, Jersey pinej 





Burial 



Sample 

 number. 



number 

 .as given 





diagram. 



44 



95 



8 



96 



94 



57 



95 



56 



105 



21 



56 



23 



81 



22 



63 



98 



82 



97 



.66 



100 



79 



99 



39 



59 



106 



61 



45 



60 



99 



101 



61 



58 



76 



102 



88 



105 



91 



103 



65 



104 



6 



26 



26 



25 



48 



24 



98 



107 



28 



62 



90 



106 



87 



63 



53 



28 



51 



27 



101 



112 



84 



64 



80 



111 



92 



110 



89 



108 



97 



29 



29 



7 



109 



65 



57 



109 



36 



30 



HOW THE SEEDS WERE BURIED. 



The foregoing list represents 109 species, 84 genera, and 34 families 

 of plants. Carefully counted seeds of these samples were mixed with 

 dry clay soil and packed in well-baked earthen pots (the common 

 flowerpot used in greenhouses). The filled pots were covered with 

 inverted clay saucers in order to prevent the seeds from being 

 destroyed or becoming mixed with other seeds which might have been 

 in the soil with which the pots were covered. By burying the seeds 

 mixed with earth in porous clay pots of this character they were sub- 

 jected to conditions almost identical with those which would exist if 

 the seeds were buried either accidentally or by natural causes. The 

 porous clay pots admitted of the free circulation of air and water. 

 30356— No. 83—05 2 



