158 Proceedings of the Boy al Physical SocieUj. 



ences between these two contaminations that led me to 

 conduct the following experiments, the result of which I now 

 lay before the Society. The first experiment related to 

 animal contamination. 



A pint of Crawley water was rendered impure by the 

 addition of 01 grs. of dried blood, and distilled in the usual 

 manner. 



The 1st distillate of albmninoid ammonia gave 0*024 grs. iier gal. 

 „ 2d „ „ „ 0-008 



„ 3d „ „ „ 0-004 



Total, . -036 



In this experiment it will be observed that the principal 

 portion of the ammonia came over with the first distillate, 

 the second and third containing comparatively small quantities. 



Experiment 2. — A small portion of powdered peat was 

 digested in half a gallon of distilled water for three days, 

 and then filtered through ordinary filtering paper, and one 

 pint distilled in the usual manner. 



The 1st distillate yielded albuminoid ammonia, '0084 grs. per gal. 

 „ 2d „ „ „ -0056 



„ 3d „ „ „ -0056 



„ 4th „ „ „ . -0028 



Total, . -0224 



In this experiment it will be seen that instead of the yield 

 being chiefly with the first distillate it came over in the first, 

 second, and third, in very much the same quantity, even a 

 fourth distillate contained a very appreciable quantity of 

 ammonia. 



The third experiment was made on the same artificially 

 prepared peaty water, only this "time it was unfiltered. The 

 results, though somewhat higher than the filtered sample, 

 were the same as regards the manner in which the ammonia 

 distilled over. 



For verification a fourth experiment was tried with 

 animal contamination. 



A small quantity of putrefying butcher's meat was digested 

 for some hours in a pint of distilled water; the yield of 

 albuminoid ammonia was as follows : 



