CHAPTER XIX 



THE USE OF THE MICROSCOPE IN MANUFACTURES 



IN how many branches of commerce, we wonder, 

 does the microscope play its part. It is used in 

 several departments of engineering for examin- 

 ing steels and many other metals not only for defects 

 but to see how they are made up. It is used in 

 brewing for studying the various yeasts and other 

 substances, including the hops which go to the 

 making of beer. All manufactures which depend 

 upon fermentation, such as wine and vinegar 

 making, are largely dependent upon the work of 

 the microscope. In dairy work the microscope is 

 invaluable. In the examination of various fabrics 

 the assistance of the microscope is always sum- 

 moned. Paper manufacture and paper testing give 

 work for the microscopist but it would, we think, 

 be easier to give a list of the branches of com- 

 merce in which the microscope is not used than to 

 attempt to enumerate those which make use of 

 the instrument. 



We cannot possibly describe all the uses to which 



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