REFERENCES 55 



views, of the epidermis of Alliitiii, Pclargoniuin (or Senecio) and 

 Iris. Ill drawings of the surface view, emphasize the shape and 

 arrangement of the stomata with reference to the epidermal cells. 

 In drawings of trans-sections, indicate clearly the extent and 

 relative thickness of the cuticle, the thickness and pitting of the 

 walls of the epidermal cells and the relation of the epidermal cells 

 to the underlying tissues of the leaf. Also draiv a' single stoma 

 from stained trans-sections of the leaf of Syriviga or Zea to show 

 the structure of the guard cells and the form and extent of the 

 substomatal cavity. 



2. Multiple epidermis. Prepare a large drawing to show in 

 detail the structure of the multiple epidermis of the leaf of Ficus 

 elastica. Include in this drawing a lithocj'st with its cystolith. 

 Label all essential structures. 



3. TricJiomes. Prepare drawings, to illustrate the structure 

 and relationship to the epidermal layer of various types of hairs. 

 If time permits, also prepare drawings of a scale from the leaf 

 of Shepherdia or Eloeagnns, of colleters as seen in trans-sections 

 of a bud scale, and of the water vesicle of the "Ice-Plant." 



4. Describe, by means of diagrammatic drawings, the ontog- 

 eny of a water vesicle in the petiole of the "Ice-Plant." Sum- 

 marize, from information given in Ilaberlandt, the most 

 important functions performed by the various types of trichomes. 



REFERENCES 



1. Ajello, L., Cytology and Cellular Interrelationship of Cysto- 

 lith Formation in Ficus elastica. Amer. Jour. Bot. 28:589- 

 594. 1941. 



2. Anderson, D. B., The Distribution of Cutin in the Outer Epi- 

 dermal Wall of Clivia nohilis. Ohio Jour. Science 34 :9-18. 

 1934. 



3. Cooper, D. C, The Development of the Peltate Hairs of 

 Shepherdia canadensis. Amer. Jour. Bot. 19:423-428. 1932. 



4. Crooks, D. ]\I., Histological and Regenerative Studies on the 

 Flax Seedling. Bot. Gaz. 95 :209-239. 1933. 



5. De Bary, pp. 29-107. 



6. Barnes and MacDaniels, pp. 107-112. 



7. Foster, A. S., Investigations on the Morphology and Com- 

 parative History of Development of Foliar Organs, I. The 

 foliage leaves and cataphyllary structures in the horse-chest- 



