Fermentations in Milk. 81 



demonstrated to be very useful. It may be used as a gas 

 where rooms are to be disinfected, or applied as a liquid 

 where desired. It is much more powerful in its action than 

 sulfur, and it has a great advantage over mercury and other 

 strong disinfectants, as it is not so poisonous to man as it 

 is to the lower forms of life. 



Bleaching powder or chloride of lime is often recommended 

 where a chemical can be advantageously used. This sub- 

 stance is a good disinfectant as well as a deodorant, and if 

 applied as a wash, in the proportion of four to six ounces 

 of the powder to one gallon of v/ater, it will destroy most 

 forms of life. In many cases this a:;ent is inapplicable on 

 account of its odor. 



Corrosive sublimate (Hg 01 2 ) for most purposes is a good 

 disinfectant, but it is such an intense poison that its use is 

 dangerous in places that are at all accessible to stock. 



For the disinfection of walls in stables and barns, com- 

 mon thin white wash (Ca OH) is admirably adapted if made 

 from freshly-burned quick lime. It possesses strong germi- 

 cidal powers, increases the amount of light in the barn, is 

 a good absorbent of odors, and is exceedingly cheap. 



Carbolic acid, creosote, and such products, while excellent 

 disinfectants, cannot well be used on account of their odor, 

 especially in factories. 



For gutters, drains, and waste pipes in factories, vitriol 

 salts (sulfates of copper, iron and zinc) are sometimes used. 

 These are deodorants as well as disinfectants, and are not 

 so objectionable to use on account of their odor. 



These suggestions as to the use of chemicals, however, 

 only apply to extreme cases and should not be brought into 

 requisition until a thorough application of hot water, soap, 

 a little soda, and the scrubbing brush have failed to do their 



