REAGENTS 



39 



Oil of Cloves. Is used as a clearing fluid for sections pre- 

 paratory to mounting in Canada balsam. 



Canada Balsam. Is used as a permanent mountmg medium 

 for dehydrated specimens, and as a cement for ringing slides. 



Paraffin. Is used for general embedding and infiltrating. 



Lugol's Solution. Is used as a test for starch and for aleurone 

 grains and proteid matters. 



Osmic Acid. A two per cent solution is used as a test for 

 fixed oils. 



Alcohol, Glycerine, and Water Mixture. Is used as a tem- 

 porary mounting medium and as a qualitative test for fixed oils. 



Chlorzinc Iodide. Is used as a test for suberin, lignin, cellu- 

 lose and starch. 



Analine Chloride. Is used as a test for lignified cell walls of 

 bast fibres and of stone cells. 



Phloroglucin. A one per cent alcoholic solution is used in 

 connection with hydrochloric acid as a test for lignin. 



Haematoxylin-Delifields. Is used as a test for celluiose. 



REAGENT SET 



Each worker should be provided with a set of reagent bottles 

 (Fig. 38), Such a set may be selected according to the taste 



Fig. 38. — Reagent Set 



of the individual, but experience has shown that a 30 c.c. bottle 

 with a ground-in pipette and a rubber bulb is preferable to other 

 types. In such forms the pipettes are readily cleaned, and the 

 rubber bulbs can be replaced when they become old and brittle. 



