APPENDIX II 155 



The teacher should explain homology and analogy at this 

 point and emphasize all cases hereafter. 



VII. The Pittosporum is the P. eugenioides, common in 

 cultivation in California, with yellowish green foliage and 

 black-stemmed twigs. The winter bud is pronounced and 

 the homology between the bud-scale and the blade of the 

 leaf is readily demonstrated. Series of scales pressed and 

 mounted upon cards may be made in either of these cases 

 or the class may work from fresh or formalin material. 



VIII. The same recommendations apply also to this 

 paragraph. 



Read Kerner and Oliver, Volume I, Part i, pp. 351-353, 

 Fig. 91 (Tulip Tree) and Fig. 92 (Beech). 



IX. Compare Kerner and Oliver, Volume I, Part i, 

 Fig. 90, 3 and 4 (p. 349) (Walnut). 



XII. Read Kerner and Oliver, Volume II, Part i, pp. 



25-28, 29, 30, 37-45. 



CHAPTER IX 



PRJEFOLIATION 

 General Reading 



Kerner and Oliver, Volume I, Part i, pp. 347-355. 

 Gray, Text-book, pp. 132, 133 (also 134-140 for flower buds 

 especially). 



FORMALIN or fresh material is necessary for the study of 

 praefoliation. The buds should be taken as they are just 

 opening if winter buds, but the vegetative buds also furnish 

 good demonstrations. If opening winter buds are not avail- 

 able, large quiescent buds will do, but they are not so easily 

 manipulated. 



