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THE POPULAR SCIENCE MONTHLY, 



tained in treating tlie natural waters. One or two hundred grammes 

 (three and a half to seven ounces) of tilled earth mixed with a pint of 



Fig. 3. Crystals of Iodoform obtained with Rain-water. 



water gave a similar precipitate of iodoform when distilled and ex- 

 posed to the reactions employed in the other experiments. The pre- 



FiG. 4. Crystals op Iodoform obtained with Snow-water. 



cipitation of iodoform by the addition of iodine and carbonate of 

 soda is a very evident test of the presence of alcohol. Iodoform 



