72 A Ar<v Dairy Industry. 



It should be understood that it is the manufacturer's 

 most urgent interest to offer in the market only such 

 bottles that will plainly show by an outward and in- 

 fallible sign that their contents are in perfect condi- 

 tion, and this sign must be one easily recognized so 

 that the consuming public will learn to look for the 

 recognized mark when buying milk. Soxhlet was 

 fully convinced of this necessity, and constructed an 

 automatic rubber sealing, which works well enough 

 when used only on the small sterilizing apparatus 

 constructed for family use, where the bottles, after 

 sterilizing, can be handled with care, but in produc- 

 tion on a larger scale where bottles have to be sent 

 long distances and be exposed to shaking in cases or 

 boxes, the Soxhlet rubber seal is quite unreliable ; 

 besides, the mouth of the bottle has to be ground into 

 a concave, which operation raises the price of the 

 bottle to a figure which places it outside of considera- 

 tion for general adoption. Stutzcr invented another 

 automatic sealing stopper, which, although it sits firm 

 and works well, is so misshapen as to be most difficult 

 to clean, also its price is about three times as high as 

 what can be allowed for an automatic sealing- device. 



The requisites demanded from a bottle to undergo 

 sterilization and for holding infants' milk mav be 

 summed up in the following points : 



The material must.be absolutely crystal clear, so that 

 imperfect cleansing may be easily detected ; it must 

 be free of air bubbles, and, in manufacturing, must be 

 very gradually cooled to produce a non-brittle glass. 



