C 3’3 3 
XIX. On expectorated Matter. By George Pearson, M. D . 
F. R . S. 
Read June 15, 1809. 
The attention of physiologists has been very much with- 
drawn, for the last half century, from the consideration of the 
different states of the circulating and secreted fluids, in conse- 
que of the opinion that the nervous and fibrous or mus- 
cular systems can afford satisfactory interpretations of the 
phenomena of living beings ; and on account of the disgust 
produced by the visionary properties and groundless hypo- 
theses, originating in the humoural doctrines of Galen. But 
late experiments have manifested, that various things taken 
into the stomach can be made at pleasure to produce consider- 
able effects, by impregnating sensibly the blood and urine, as 
well as the milk, sweat, and perhaps saliva. Further ; the fine 
experiments of Professor Colman have shewn, that the conta- 
gious glanders may be excited in the ass by the transfusion of 
the blood of a giandered horse, and the matter from the nose 
of the giandered ass can produce this disease in the horse or 
the ass.* Hence I apprehend it is reasonable to expect, that 
the farther investigation of the properties of the animal 
fluids will afford gratifying instruction to the Researcher in 
* Mr. Colman alleges, that there is not a sufficient quantity of blood, in a single 
giandered ass, to excite the glanders by the transfusion of blood into the horse. 
