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 mounting 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. 
Hzmatoxylin-Delifields. Is used as a test for celluose. 
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 
Fic, 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. 
