2 MICROSCOPICAL RESEARCH 



Commercial methylated spirits may be used for scientific purposes when it 

 is not necessary to use it for making up lower percentages by the addition to it 

 of water, on the addition of which it becomes turbid, and specimens or sections 

 when placed in it cannot be observed. For permission to use "ordinary" methylated 

 spirits, free from the mineral additions, a permit must be obtained from the 

 Excise authorities, for which purpose information may be obtained from any of 

 the Excise offices. 



The following table of factors for converting from one scale to the other will 

 be found useful by the Student in working out formula, etc. : — • 



28-42 cc.= i fluid ounce. 568-34 cc. = one pint. 1000 cc. = 35-196 fluid ozs. 



Absolute alcohol of Commerce is generally 99-4 to 99-95%. 



The sp. gr. of Ether used in the Celloidinizing process is -720 

 „ „ of Chloroform used in the Paraffin and Celloidinizing 



process is 1-490- 



„ „ of the Oil of Cloves used in this work is ro52 



„ „ of the Oil of Cajeput used in this work is -921 



„ of the Oil of Bergamot used in this work is "884 



-I '495 



