Doctor Seuss wrote his first book for children in nineteen thirty-seven.  It is called "And To Think I Saw It on Mulberry Street."  A number of publishers rejected it.  They said it was too different.  A friend finally published it.  Soon other successful books followed.  Over the years he wrote more than forty children's books.  They were fun to read.  Yet his books sometimes dealt with serious subjects including equality, responsibility and protecting the environment.

By the middle nineteen fifties, Doctor Seuss had become one of the best-loved and most successful children's book writers in the world.  He had a strong desire to help children.

In nineteen fifty-four, Life magazine published a report about school children who could not read.  The report said many children's books were not interesting.  Doctor Seuss decided to write books that were interesting and easy to read.  He used rhyming words, words with the same ending sound, like fish and wish.

In the book "Hop on Pop," he presented two words.  Then he used them in simple sentences like this.  Day. Play.  We play all day. Night.  Fight.  We fight all night

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