GO Dr. Buchanan on the State of the Blood after taking Food. 



filter, so as to get the liquids again quite clear. I now saturated each solution with 

 the salt not before dissolved in it, when I obtained a fresh precipitate in each about 

 as abundant as at first. Still farther, on filtering the liquids again, and saturating 

 with sulphate of magnesia, I obtained an additional precipitate, but much less 

 abundant than I obtained with that salt used in the first instance. 



I now tried various other salts, the mode of action of which will be best seen 

 from the following Table, from which are excluded all saline substances, such as the 

 acetate of lead, chloride of mercury, and sulphate of alumina and potass, which, in 

 whatever quantity added, produce a precipitate in serous liquids. It comprehends 

 only those substances, which may be added in any quantity under the point of satu- 

 ration, without troubling the serum. These may be divided into three classes. 

 Some of them like common salt, produce a precipitate resoluble on the addition of 

 water ; some, like the carbonate of potass, and muriate of lime, cause a precipitate 

 not resoluble by water, and some, like the phosphate of soda, cause no precipitate. 



Chloride of Sodium, Abundant Precipitate, Resoluble. 



Sulphate of Soda, Do. Do. 



Carbonate of Soda, Considerable, Do. 



Sulphate of Magnesia, Abundant, Do. 



Tartrate ofPotass, Do Do. 



Tartrate of Soda and Potass, ...Considerable, Do. 



H. 



Carbonate ofPotass, Abundant, Not Resoluble. 



Bicarbonate ofPotass, Slight, Do. 



Muriate of Lime, Abundant, Do. 



rn. 



Phosphate of Soda, No Precipitate. 



Borate of Soda, Do. 



Bicarbonate of Soda, Liquid slightly turbid. 



Sulphate ofPotass, Do. 



Nitrate ofPotass, No Precipitate. 



Chlorate ofPotass, Do. 



Hydriodate ofPotass, Do. 



Triple Prussiate, Do. 



Sulphate of Iron, Do. 



Carbonate of Ammonia, Do. 



Muriate of Ammonia, Do. 



A solution of the albumen ovi gives a precipitate on being saturated with salt, 

 but it is not resoluble on the addition of water. 



I may now relate a few additional experiments and observations, 

 some of which were made before those last mentioned, but the account 

 of them was deferred, not to interfere with the preceding argument 



CnYLB and Serum. — Having obtained a little chyle from the thoracic duct of a 

 dog fed a few hours previously with oatmeal porridge and milk, I mixed it with some 

 serum which I had brought with me for the purpose. It rendered the serum turbid, 

 and very like in appearance to that which separates from blood after taking food. 

 A very delicate voluminous coagulum soon formed in the liquid. 



Serum of Diabetic Blood. — Towards the end of July, I obtained from a medical 

 friend some very opaque serum from the blood of a woman labouring under dia- 

 betes, for which she had been bled three times, the blood each time exhibiting the 



