26 



Mounting Media 



Decimal Divisions Used in Chapter 



M 00 GENERALITIES 



M 10 MOUNTANTS MISCIBLE WITH WATER 



11 Gum arable media 

 11.1 Formulas 



12 Gelatin media 

 12.1 Formulas 



13 Other media, including mixtures of 11 and 12 

 13.1 Formulas 



M 20 MOUNTANTS MISCIBLE WITH ALCOHOL 



21 Gum mastic media 

 21.1 Formulas 



22 Venice turpentine media 

 22.1 Formulas 



23 Gum sandarac media 

 23.1 Formulas 



24 Other media, including mixtures of 21, 22, 23 

 24.1 Formulas 



M 30 MOUNTANTS NOT MISCIBLE WITH EITHER ALCOHOL OR WATER 



31 Canada balsam media 

 31.1 Formulas 



32 Gum damar media 

 32.1 Formulas 



33 Other natural resin media, including mixtures of 31 and 32 

 33.1 Formulas 



34 Synthetic resins and plastics 

 34.1 Formulas 



M 00 Generalities 



A mountant is a material in which an 

 object may be permanently preserved for 

 microscopical examination and which has 

 inherent in it the property of holding the 

 coversUp in place. There is a tendency to 

 confuse niountants with preservative 

 media, wliich are dealt with in Chapter 17. 

 A preservative is a material in which an 

 object may'^be permanently preserved but 

 which does not have in it the inherent 

 property of holding the coverslip in place, 

 and which must, therefore, be sealed with 

 cement or by some other method. 



Mountants may be divided into three 



groups according to the treatment which 

 the object must receive before mounting. 

 The first group {M 10 below) contains 

 those mountants which are miscible with 

 water, and to which, therefore, the object 

 may be directly transferred either from 

 water or from glycerol. The second class 

 (M 20 below) comprises those mountants 

 which are miscible with alcohol and to 

 which objects maj' therefore be trans- 

 ferred after dehydration but without 

 having passed through a clearing agent. 

 The third class of mountants (M 30 

 below) are the conventional resins and 



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