72 SCLEREIDES 



3. Draw several types of astrosclereides from the macerated 

 ' ' husk ' ' of the fruit of Carya or Juglans. For comparative pur- 

 poses, draw a parenchyma cell resembling in its form one of these 

 sclereides. 



4. Prepare a diagrammatic drawing of the trans-section of 

 the petiole of Camellia, showing the position of the astrosclereides 

 with reference to other tissues. Draw a single astrosclereide, as 

 seen under high magnification, from the petiole and from the 

 lamina of the leaf. 



5. Draw a few connected macrosclereides from the testa of 

 the bean seed. Show carefully the wall structure and the form 

 of tlie lumen. 



REFERENCES 



1. Alexandrov, W. G., and Djaparidze, L. I., Uber das Enthol- 

 zen und Verholzen der Zellhaut. Planta 4 :467-47o. 1927. 



2. Crist, J. W. and Batjer, L. P., Tlie Stone Cells of Pear Fruits, 

 Especially the Kieffer Pear. Ag. Expt. Station Michigan 

 State College. Tech. Bulletin 113. 1931. 



3. De Bary, pp. 126-128. 



4. Eames and MacDaniels, pp. 57-59. 



5. Haberlandt, pp. 158-161. 



6. Hayward, p. 25. 



7. Netolitzky, F., Anatomic der Angiospermen Samen. Iland- 

 buch d. Pflanzenanatomie. X. 1926. 



8. Tobler, F., Die mechanischen Elemente und das mechanische 

 System. Handbucli d. Pflanzenanatomie. IV. 1939. 



9. Tschirch, A., Beitrjige zur Kenntniss des mechanischen 

 Gewebesvstems der Pflanzon. Jahrb. Wiss. Bot. 16:303-335. 

 1885. 



10. , Angewandte Pflanzenanatomie. Wien und 



Leipzig. ]889. 



11. Zimmermann, K.. Zur })hysiol()gisc]ier Anatomic der Legu- 

 minosentesta. Landw. Versuchs-stat. 127 :l-56. 1936. 



