The following pages concisely show the marvelous growth of the Field of Invention from Primitive Man's Three Fundamental Wants, namely, Food, Clothing and Shelter, to the present-day countless necessities of Twentieth Century life. The same marvelous broadening of the field is found in all directions. The few illustrations given on the following pages will illustrate the point, and direct the thoughts of the student unerringly to the almost illimitable sphere of invention.

CHART PARTIALLY ILLUSTRATING THE VAST GROWTH OF THE
FIELD OF INVENTION FROM PRIMITIVE MAN'S THREE
FUNDAMENTAL NEEDS TO THE PRESENT DAY
ESSENTIALS OF CIVILIZATION.

FOOD

HScythes,
ASickles,
RRakes, Reapers,PLANTING{Garden Tools, Plows, Harrows, Rollers, Planters, Seed Drills, etc.
VMowers,
EBinders,
SThreshers,
TStackers,CULTIVATING{Cultivators, Sprinklers, Weeders, Insect Destroyers,Fertilizers, etc.
ILoaders,
NUnloaders,
GGrain-elevators, etc.
STOCK RAISING{Fences, Harness, Incubators, Brooders, Milking Machines, Creameries, etc.
MCrates, Boxes,
AStores, Scales,
RPackages,SLAUGHTERING{Conveyors, Pens, Grinders, Stuffers, etc.
KDelivery-systems,
EOffice Appliances,
TStationery,
IPrinting,HUNTING{Bows and Arrows, Snares, Traps, Guns, Bags,etc.
NPens, Pencils,
GInks, Rubbers, etc.
PCutlery,
RStoves,
EKettles,
FISHING{Nets, Hooks, Lines, Boats, Canneries, Kits, etc.
PBroilers,
AOvens,
RCondiments,
IGrinding,
NDistilling,
GEvaporating, etc.
SElevators,
TRefrigerators,
OCanning,
RCuring,
IDrying,
NPickling,
GEvaporating, etc.
A
MMusical
UInstruments,
STheatres,
EParks,
MCards,
EGames,
NToys,
TMoving
SPictures, etc.