ed. During the winter, in many cases the chimney
draught would be sufficient to produce the desired currents of air
without the pump.

All the means here spoken of have already been and are in satisfactory
operation in various places. The chimney-valves have been made by Mr.
Slater, gas-fitter, 23, Denmark Street, Soho, and Mr. Edwards, 20, Poland
Street, Oxford Street. The pump by Mr. Bowles, 58, Great Coram Street,
and Mr. Williams, 25, Upper Cleveland Street. The stoves by Mr. Edwards,
Poland Street, Messrs. Bramah and Co. Piccadilly, Messrs. Bailey,
Holborn, and others.

I am, my dear sir,
yours very truly,
N. ARNOTT.

* * * * *

CHARLES WHITTINGHAM, CHISWICK.

THE FOUR NECESSARIES.

In fit Kind and In Deficiency. In Excess.
Degree.

1. AIR Suffocation Excess of Oxygen.

Unchanged Air.

2. TEMPERATURE Cold (intense) Heat (intense.)

3. ALIMENT:--

Food Hunger Gluttony, or Surfeit.

Drink Thirst Swilling water.

4. EXERCISE:--

Of the body Inaction or Fatigue or
Exhaustion.

Of the mind Ennui Want of Sleep.

Certain depressing Certain exciting
passions, as fear, passions, as anger,
sorrow, &c. jealousy, &c.

Of the mixed Solitude Debauchery.
social aptitudes.

THE TWO NOXIOUS AGENTS.

1. VIOLENCE:--

Wounds,--Fractures,--Burns, &c.--Lightning.

9. POISONS:--

Animal, Mineral, Vegetable.

Certain of these, such as _alcohol_ in its various forms, opium, tobacco,
&c. which in large quantities kill instantly, when they are taken in very
moderate quantity can be borne with apparent impunity, and are sometimes
classed as articles of sustenance, or they may be medicinal, but if taken
beyond such moderation, they become to the majority of men destructive
slow poisons.

Contagions,--as of plague, small-pox, and measles.

Malaria of marshes, thickets, and of filth.