PLA^T J*liUBLEMS To 



5. Discuss the advisability of liaving foreign s«m'«1s and grains in- 

 spected before being allowed to enter this country. 



6. Discuss the advantage of smothering weeds with (piick-growing, 

 thickly seeded crops, like red clover and rye. 



7. Test the germinating power of a weed by placing its seeds on daniji 

 blotting paper between two plates. 



8. Kecord instances observed of weetis damaging food plants. What 

 did Darwin mean by the "struggle for existence" and "survival <»f the 

 fittest"? (Ref. : Hodge, "Nature Study and Life," chaj.. vii.) 



Copy the following list of poisonous i)lants into your notebook, and 

 make the acquaintance of each one, if }»ossible, during outdoor tramjis. 

 Increase the list by wider observation. 



Poison ivy — Rhus radicans [poison oak, three-leaved ivy, merrury, 

 black mercury, markweed, pikry (Maine)]. 



Poison sumac — Rhus vernix [swamp sumac, dogwood (Massachu- 

 setts), poison elder (Alabama), ])oisou ash (Vernu)nt), tlnuKlerwoo*! 

 (Georgia, Virginia)]. 



Poison oak — Rhus rflrersi/oJia [poison ivy, ycara, ('alif(»i-nia ]»oison 

 sumac]. 



Poison hemlock — Coniuin iiuiculatum [hemlock, wild hemloi-k, spotted 

 parsley, stinkweed, poison root, poison snakeweed, cashes, wo<le-whistle]. 



AVater hemlock — Cicuta maculaUi [spotted parsley, snakeweed, l>«*aver 

 poison, musquash root, muskrat weed, cowbane, spotted cowi>ane. chil- 

 dren's-bane, death-of-man]. 



Pokeweed — PiDjtolacca dtcandrn. 



Corn cockle — Agrostenima (I'lthugo. 



Black cherry — Prunus serotina [wild cherry, rum cherry]. 



Red buckeye and connnon horse-chestnut — .Ksculus paria and 

 hippocastan um. 



Broad-leaf laurel — Krdinut hitlfo/id [laurfl (north of Maryland ). ivy 

 (south of ^Maryland), mountain laiml, slict p laurel, jioison laurel, W(M>d 

 laurel, small laurel, high laurel. AnuM-ican laurel, jtoison ivy. ivy btjsh, 

 ivy wood, big ivy, calico bush, spoonwood, kalniia, w icky]. 



Xarrow-leaf laurel — Kahuia anffusfi/olla [sheeji launl, lambkill. sheep 

 poison, lamb laurel, small laurel, low laun-l, dwarf hmrel, wicky]. 



Jimson weed — Datura stranioiiium and D. talula, the taller and 

 purple-flowered species [Jamestown weed, common stramonium, thorn 

 apple, apple of Peru, devil's ap])le. stinkwort, stinkweed, Jamestown lily, 

 white man's plant (by the Indians)]. 



