Dr. Pearson on expectorated Matter. 335 
case, although the proportion of expectorated matter be ex- 
ceedingly small to that of the water. 
2. When very hot water is used, namely, that of the tem- 
perature of 190° to 210°, a still greater number of motes are 
perceivable, especially with a lens, and the water is rendered 
milky. 
3. Brisk agitation is required, for a due length of time, to 
diffuse the other kinds of expectorated matter through cold 
water ; but a great number of fibrous and membranous pieces 
appear, whose form cannot be destroyed or only partially, by 
shaking, in almost any proportion of water. Three drops of 
ropy and opaque matter were shaken in half a pint of distilled 
water. About one half of them was diffused ; the rest was in 
the form of small fibrous, leafy, and irregular figured motes ; 
which, on repose, formed a sediment, and remained in that 
state three months ; although in that time the water became 
highly foetid, and sometimes in this experiment the sides of 
the vessel were tinged black. 
4. Agitation of these sorts of expectorated matter (3), in a 
large proportion of water at the temperature of 170° and up- 
wards, produced a greater degree of milkiness, and a greater 
number of small masses, which could not be dissolved by long 
shaking. Putrefaction did not take place so soon in these mix- 
tures, as in those with cold water. 
5. If the proportion of the last mentioned kinds of expec- 
torated matter be two or three parts to one of cold water, or 
under the temperature of coagulation, an uniform mixture 
may be produced by violent agitation, the water being en- 
tangled by the viscidity of the matter rather than chemically 
united. 
Xxa 
