Chemistry and Physics. 493 
barely balanced by loss of nitrogen originally present in the 
mise It has been shown that within a practically reasonable 
time enough water for the application of the combustion process 
may be evaporated in a closed vessel and under red ponnoes 
pressure at a temperature but little over 30° C., and th ecid- 
edly abit results may be obtained by thus Sr wg the 
proce 
(3.) Se regard to the Wanklyn “ ammonia process” it has been 
ascer Bee that in the determination both of “free” and “albu- 
minoid” ammonia there is a loss, sometimes quite considerable in 
amount, pean from imperfect condensation of the ammonia 
Saning distillat 
(4.) In the shies of the same process it has been proved 
ing the distillation for “free” ammonia, and the amount of 
so-called ae minoid ” ammonia thus made to appear less than 
it should 
fixed ratio thereto. It cannot be taken my measure either o 
the organic carbon or of the total organic Ser though a i 
tinct general resemblance can na og between strongly mF 
results, high or low, as the case may be, for the consumption of 
oxygen on the ane hand and pistons eine (by the se i si 
process) on the o 
(6.) The pooja commonly drawn from the ratio of carbon 
to nitrogen in the organic matter of water as to this organic mat- 
facture of starch, lead to the belief that rar erie matter was 
present, while in water to which an infusion of human feces had 
been add ed the ratio in question would aiate vegetable 
impurit 
(7.) The e biological ee tee piale (on rabbits) serve to show that 
the general belief in the greater danger arising from the presence 
of animal rather aan area organic matter in water is not to 
e accepted without qualification or exception. Most rain 
marked pathological effects were produced aa yk ified jee repe- 
tition) by water to which there had simp dded an 
infusion of dead forest leaves, such as is washe a sens: in ag Pe 
quantity in autumn and winter from the surface of any woodland 
country. 
(8.) The very small absolute — of ps oe matter indi- 
cated as present in many of the most dangerous waters examined 
furnishes evidence against any purely wi A a prota of the pro- 
duction of disease tn this source, and tends to support the 
