SEEDS. O 



VII. Study wheat in the same way that you have 

 Indian corn, and compare the structure of the two grains. 

 Compare oats with both. 1 In what respects are all three 

 alike ? Point out the differences between them. 



VIII. Write a full account of your observations of 'these 

 grains. Point out two important particulars in which 

 they differ from peas and beans. 



SEEDS OF WHITE PINE. Pinus Strobus, L. 



I. Observe all the external features. Draw in outline a 

 perfect specimen. Compare the seeds of Austrian pine or 

 Norway spruce. 



II. Remove the testa, exposing the kernel enclosed in 

 the delicate inner seed coat. 



III. Make both longitudinal and transverse sections of 

 the kernel. Notice 



1. The form and position of the embryo. 



2. Around this the white, oily endosperm. Draw. 



IV. Remove the embryo and examine under a good 

 lens. How do the two ends differ? How many coty- 

 ledons are there ? 



V. Write a complete description. In what important 

 particulars does the seed of the pine differ from those 

 previously studied? 



PHYSIOLOGY OF SEEDS. 

 Storage of Food. 



I. Cut through one of the cotyledons of a common 

 bean and scrape the exposed surface lightly with the 



1 Cf. Arthur, Barnes, and Coulter, Plant Dissection, pp. 179, 180. 



