CHAPTER XXXV. LAWN MOWERS; INCUBATORS 195

245. Operation and care of lawn mowers. 246. Storing mowers. 247. Scissors and shears. 248. Principles upon which incubator works. 249. The body of the incubator. 250. Incubators heated by a lamp. 251. The wick. 252. Thermostat. 253. The thermometer. 254. Operation of incubator. 255. Egg tester.