A CLASS LIST OF PREPARATIONS 385 



MONOCOTYLS 



83. Clintonia. — Transverse section of stem to show siphonostele. Paraffin. 

 Safranin and anilin blue. 



84. Acorus calamus. — Transverse sections of rhizome, freehand or paraffin, 

 to show amphi vasal bundles. 



85. Zea mays. — Transverse section of stem to show scattered bundles; also 

 good for companion cells. Paraffin. Safranin and anilin blue. 



86. Tradescantia virginica. — Longitudinal sections of root-tip. Paraffin, 3 and 

 5 (J.. Stain for mitosis. 



87. Smilax herbacea. — Transverse section of adult root. Freehand. Shows 

 exarch, radial structure, and a highly developed endodermis. Safranin 

 and Delafield's haematoxylin. 



88. Lilium. — Transverse section of leaf. Freehand. Transverse section of 

 ovaries in various stages from megaspore mother-cell to fertilization; 

 transverse sections of anthers to show microspore mother-cells and reduc- 

 tion of chromosomes; also later stages with nearly mature pollen. Paraffin 

 5 to 10 M. 



89. 7m. — Section of young seeds to show embryo with cotyledon and stem- 

 tip. 



90. Sagittaria. — Longitudinal sections of ovulate flowers of various stages to 

 show development of the embryo and endosperm. 



91. Zea matjs. — Longitudinal and transverse sections of embryo (sweet corn, 

 roasting-ear condition) to show structure of root and beginning of pro- 

 toxylem. 



