i8 



now A I'l.AN'f (;k'is ou'i' of 'i itK sFJ'n. 



rit^itrc iH. 



Buckwheat with two colvleo'ons or 

 ic.ec;-lec.vt6 unloldvtl- 



lo. CASi'OK-oii, liKAN. The seed 

 of c;isloi'-<^il bean is the source 

 Ironi whirl) oil is (h-rivcf). TIk^ 

 seed •>( our ( oimiik)!! variety is 

 longer lliaii Ijruad, nearly oval, 

 with a white fleshy outgrowth. At 

 one side is a prorriiiieiit ridge which 



divides the seed into two haives- 

 C)n the lowe-r side the seed is 

 rounded out. Tlie seeds of our com- 

 mon variety are smooth, shining, 

 gray in color marked with brown 

 spots. Fig 19. We will now cut 

 the seed leiiglJi wise; the Jiard, 

 smooth testa is somewhat brittle. 

 The bulk of the seed is made up of 

 endosperm which is very oil)-, and 

 contains an abiindancft ot albii- 

 iiicii. Slarc:h ts ahsi'iit. The small 

 embryo oceurs lu the eiulosix^rm. 



L'ig. 20. 





LW 



I'lgurc i'j. 



l''itrur(: 20. 



Castor oil bean. The sculptured testa or 

 teed coat. The caruncle shown at "" . 



>r(>W I'l.ANIS (iKKMINATf-:. 



Cross-section ss <> 



castor oil bean. '• elonerat- 

 cd embrvo surrounded by 

 the endosperm and the seed 

 coats on the outside, '■ ". 

 We shall now undertake to find out some The caruncle, '.'', an nut- 



grrowth over the hilom com- 



siniide things about the way jdants g(;rminate, inir from the micropyie. 

 and tins can be dont- only by exiM-rinicnting. 'Ihis is the only 

 way that we can acfpiire the information we want. For these pur- 

 poses it will be ncccessary for the t«acher to get a l)ox or pan 

 three or lour Icct long, two feet wide ami four inches dee]). 

 I'lll this with three inf:lies of sand, moisten and ])lant witl) two 

 dozen beans md two doAci) |>eas. The box should be- kei>t at a 

 comloitablf lemiurat uie during the day,-- a room in which child 



