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The Cornell Reading-Courses 



bolic acid.* Either creoline or zenoleum may be recommended to do 

 the work without having an injurious effect on the hatch, provided the 

 directions are followed. Crude carbolic acid is a good disinfectant, but 

 it has a very strong, disagreeable odor. There is also danger of leaving 

 oily spots in the incubator unless the solution is kept well stirred. The 

 odor from the two first-named liquids is mild and inoffensive. It is also 



Fig. 42. — The parts of an incubator and the spraying outfit, ready for disinfecting 



easier to dry the machine after their use. Of these two, creoline is the 

 more expensive. In using any one of the three agents, the proper propor- 

 tion is one part of the disinfectant to nineteen parts of water, the mixture 

 being stirred thoroughly. 



The incubator should be carefully dried and aired before it is used again. 

 It is well to close the door of the machine for a day, keeping the lamp 

 lighted, after which the door may be left open over night or until the 

 incubator is well aired. 



* Creoline, zenoleum, or crude carbolic acid may be purchased at most drug stores. 



