tem of word building, which
enables anyone to derive from a dozen to one hundred and more words from
every root, there being to this derivation no limit but that of common
sense.

Of course, the vocabulary for science and technology is considerably
larger, but equally flexible.

(e) There are no troublesome genders; sex is expressed by the insertion
of "in" before the "o" ending of nouns, and of course only in the case
of animate creation. For instance, "viro" is man, "virino" woman,
"frato" brother, "fratino" sister, "kuzo" male cousin, "kuzino" female
cousin, etc. And here Esperanto has over all other languages not only
the signal advantage that there are no irregularities, but the far
more important advantage that the scheme is applicable to all cases.
For instance, although we have in English from 30 to 40 different
ways of forming the feminine such as father, mother; brother, sister;
uncle, aunt; bull, cow; stallion, mare; fox, vixen; etc., yet in most
cases we possess no decent or sensible way to indicate the sex of the
individuals; as, for instance, in the cases of teacher, doctor, friend,
cousin, neighbor, witness, elephant, camel, goat, typist, stenographer,
companion, president, chairman, etc.

Last, but not least, every word parses itself by its distinctive ending.

(7) The stupendous flexibility of Esperanto will be still better
understood if I state here that it possesses some 30 particles (prefixes
and suffixes), each with a definite meaning and each available whenever
you want to attach that particular meaning to any word.

We have already seen that the suffix "in" expresses the female sex
whenever it may be desirable to give it expression. So "id" denotes
the offspring, "il" the tool or instrument, "isto" the profession,
"ul" the person or individual, "ec" the quality (abstract), "ajx"
the concrete thing, product, or result, "eg" means large, and "et"
small, etc. Now, let us see how this works out in practice. Bovo is
bull; bovino, cow; bovido, calf; bovajxo, beef; bovidino, female
calf. And you may say bovego, boveto, bovinego, bovineto, bovidego,
bovideto, bovidinego, and bovidineto if you wish to add the idea of size
or smallness to the original or to the derived word.

Again: "Lern" is the root for learning. We first get lerni, to learn;
lerna, learned; lerne, learnedly; learno, learning. Next, using a few of
the particles we can make: lernebla, capable of being learned; lernema,
inclined to l