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 Description of the Experiments. 



1. Cavy 650 grams. 



First 24 hours without food, then for 24 hours exclusively dough 

 and soot, then killed. 



Result* : Macroscop. intestines much soot, lungs grey with small 

 black spots, especially in the upper lobes, bronchial glands distinctly 

 pigmented. 



Microscop. In the interstitial spaces of the lung-tissue are many 

 cells with black pigment especially under the pleura. A very small 

 quantity of it is also found in the alveolars and in the bronchi. The 

 bronchial glands contain a great many cells with black pigment, 



2. Cavy 200 grams. 



For 48 hours exclusively dough and soot, then killed. 



Results: Macroscop. intestines much soot, lungs and bronchial 

 glands pale; microscop. lungs and bronchial glands few cells with 

 black pigment. 



3. Cavy 760 grams. 



First 24 hours without food, then 5 ccm. of Indian ink in dough, 

 killed after 24 hours. 



Results: as in experiment 1. 



4. Cavy 350 grams. 



First 24 hours without food, then for 48 hours exclusively dough 

 and soot, then killed. 



Results: Macroscop. intestines much soot, lungs many black spots 

 and points, bronchial glands pale; microscop. there are foodparticles 

 mixed with soot in many bronchi and alveolars. For a part the soot 

 has already been enclosed in cells, many cells have already penetrated 

 into the interstitial spaces. No pigment is to be seen in the bron- 

 chial glands (so in this experiment the coal was aspirated during 

 life; not in agony). 



5. Cavy 400 grams. 



First 24 hours without food, then 0,5 grams of carmine in dough ; 

 killed after 48 hours. 



Results: Except in the intestines no carmine can be found. 



6. Rabbit 1.75 K.G. 



For three days 100 mgr. of soot is brought into the stomach by 

 means of a catheter; killed after 24 hours. 



Results: Macroscop. lungs and bronchial glands pale; microscop. 

 few cells with black pigment are to be seen in the interstitial spaces 

 of the pulmonary tissue. 



