3G2 
Supplement l<> Hie "Tropical Agriculturist.: 
[Nov. I, 1*<I4. 
Ordinarily, the egg is then expelled, but in the 
case of the production of a double-yoked egg a 
reverse action of the oviduct takes place, and the 
egg is carried hack, meets with another ovum and 
re-descends with it, the two being surrounded 
with albumen, membrane, and shell. 
Forests are of importance to a country, first 
as a source of timber and fuel, and second on 
account of their hygienic and climatic influences. 
That is to sny, they are beneficial as directly 
increasing the national wealth, and as exerting 
an influence on the soil and climate. In regard 
to the latter, it has now been ascertained that 
forests modify the soil drainage, and thereby 
improve miasmatic conditions. In other words, 
forests have a tendency to relieve the air of 
the deadly poisons which rise from swamps and 
morasses; by opposing obstacles to air currents 
they prevent the dissemination of poisonous air 
particles, they reduce the extremes of air tem- 
perature, they increase the relative dampness of 
the air and regulate the rainfall, and they pro- 
tect and control the waterflow from the soil. 
These results, flowing from the scientific planting 
of forests, are of vital importance to the health 
and fertility of a district. 
It must be owned that there are those who do 
not regard the suggestion of forest exhaustion as 
a serious one. They argue that the prophecy is 
no new one, and yet we are none the worse off 
than we have been ; that failing supply from one 
source, it has always been possible to tap another, 
and so it will probably continue ; and then the 
period when exhaustion is likely to take place is 
so far off, there is ample time for the growth of 
new forests to replace those being cut. No doubt 
there is time. But this is just the kernel of the 
whole forestry question. With proper conser- 
vancy of forest areas, the application of scientific 
principles to the recuperation of areas recklessly 
denuded, and the afforestation of barren and waste 
lands, timber sufficient to meet a greater demand 
than is now made could be produced. This is the 
aim of scientific forestry, and it is to secure thtl 
that those who have given attention to the subject 
are working, conceiving it to be a duty of this 
generation to hand down to its successor* a heri- 
tage no less valuable than that which it received. 
The pig's legs perform a function not known to 
any other animal, and that is of an escaj>e pipe nr 
pipes for the discharge of waste water or 8w<jat 
not used in the economy of the body. These 
escape pipes, says the Swine Breeder* Journal, are 
situated upon the inside of the legs, above and 
below the knee in the forelegs, and ubove the 
gambrel joints in the hind legs, but in the latter 
they are very small and functions light : upon 
the inside of the foreleg they are in the healthy 
hog always active, so that moisture is always 
there from about and below these orifices or duct? 
in the healthy hog. The holes in the leg and 
breathing in the hog are the principal and only 
means of ejecting an excess of heat above nornin), 
and when very warm the hog will open the mouth 
and breathe through that channel as well. The 
horse can perspire through all the pores of the 
body, like man, and cattle do the same to a 
limited extent, but the hog never. His eefeftpe 
valves are confined to the orifices upon the inside 
of his legs. 
The Lotmiann Planter refers to a report 
which states that " a process has been recently 
discovered for utilizing the nitrogen of the air 
in the production of sulphate of ammonia. It is 
said that when the gases or vapore of coal or 
petroleum are heated to 2200 deg., the carbon and 
hydrogen separate ; air is introduced, the mixed 
gases are passed over me, a cyanide is formed 
which is decomposed by steam, and finally 
sulphate of ammonia is obtained, at a cost of a 
cent a pound. We quote this reported process 
simply for the purpose of showing that the 
chemistry of a not distant dny may be able to 
extract a fertilizer from the air which will reno- 
vate our soils and increase production.'" 
