NATURE-STUDY LESSONS. 97 



{b) Examine closely their bodies while they are on 

 the dandelion. What do you observe on 

 them? 



(c) Infer how pollen is placed on the stigmas of 

 dandelions. 



{d) Of what use are insects to dandelions ? 



E. The Frnit. 



78. {a) Examine a seed from a ripened head with a 



lens. 

 {b) Describe it and its appendage. 

 {c) Draw it. 



79. (a) Observe a seed which has settled among short, 



thick grass. 

 {b) Which part is uppermost ? 

 {c) Why cannot it mount again into the air? 

 {d) What useful purpose is served to the plant by 



the barbs on the sides of the seeds ? 



XXV.-A HORSE-CHESTNUT BRANCH. 



Observations on the horse-chestnut branch should be continued through- 

 out the year, but more particularly during the periods of leaf and fruit 

 shedding and bud-development. 



A. The Branch. 



I. (a) In what direction do the branches of horse- 

 chestnut trees grow in relation to the trunk? 

 (3) What shape do the branches thus give to the 

 horse-chestnut tree? 



(c) Compare the general direction of the branches 



of the horse-chestnut, maple, beech, elm, and 

 Lombardy poplar with reference to the main 

 axis. 



(d) Account for the difference in shape of the horse- 



chestnut, beech, and Lombardy poplar. 



