2698 Journal of Applied Microscopy 



3. Mount some wheat flower in water and treat with iodin. Note the blue 

 colored starch and the yellow colored proteid material. 



4. Mount a hair of common cotton {Gossypiufn Jierbaceiim L.). It is made 

 up of nearly pure cellulose except the small central cavity in which is a small 

 amount of dry protoplasm. Draw. Treat with Schulze's solution (Chlor-zinc- 

 iodin) and after a while note the color reaction. Care must be taken so as not 

 to get any of this solution on the microscope as it is strongly acid. Schulze's 

 solution can be obtained from the dealers. 



5. Test a cross section of a sunflower stem (from alcoholic material) with 

 Schulze's solution, examine, and note the cellulose reaction in walls of the cor- 

 tical and pith cells. 



6. Treat a section of a sunflower stem with phloroglucin, mount and study 

 color reaction in the xylem bundle. Care must be taken in its use as it con- 

 tains an acid. 



7. Cut cross sections of a young twig of linden preserved in alcohol, treat 

 with phloroglucin, mount, and note color reaction in the wood. 



XCAai. Crystals. 



The material for sectioning may be preserved in alcohol. 



1. Cut cross sections of the rhizome of the large blue-flag {Iris versicolor L.), 

 mount, and under high power draw the simple crystals present. 



•2. Cut sections of rhizome of the wild crane's bill {Gera)iiu7n maculatum 

 Tourn.), mount, and draw the large compound sphere-crystals. 



3. Cut sections of the rhizome of the lily-of-the-valley {Convallaria majalis 

 L.), mount, and draw the bundles of needle-shaped crystals, raphides. 



4. Cut cross sections of the leaves of the India-rubber fig {Ficus elastica 

 Roxb.), mount, and draw the large cystoliths which are amorphous masses of 

 mineral substance suspended from a pedicel. The mineral substance of the 

 cystolith is mainly calcium carbonate. 



XCVIII. Liptochrome. 



1. Cut thin sections of the rind of an orange, mount in water, and examine 

 under high power. Draw a cell showing the chromoplasts. 



2. Cut sections of the root of the common cultivated carrot {Daiicus carota 

 L.). Mount and draw a cell showing the chromoplasts. 



3. Mount pieces of the yellow corolla of the squaw weed {Senecio aureus L.) 

 or any other yellow flower, examine under high power and draw a cell with 

 chromoplasts. Describe the cause of the yellow color in these tissues. 



XCIX. Anihocyan. 



1. Cut sections of the root of the red garden beet {^Beta vulgaris L.), mount, 

 and examine under high power. Note that the red coloring matter is in the 

 cell sap. 



2. Cut sections of any leaf with red color as the red leaved coleus {Coleus 

 blumei Benth.), mount, and study the color under high power. 



