This book is part of a popular series that introduced science to children in the 1960s, was authored by Martin Keen and illustrated by Darrell Sweet 
Condition:  There are condition issues which makes this a great example of a book to use for ephemera junk journalling, etc.. It is complete and there are no major issues but there is a girl's name and her school info on the title page and there is a tiny tear at the bottom of one page. This is shown in the photos with an arrow pointed to the tear. The pages show age and yellowing/foxing as typical with this era of paper. 
Measurements: Book measures approx 8" x 11".  
 

I ship all of my ephemera in a manila paper mailing envelope with a 100% acid free archival safe cardboard backer and cellophane pocket (the kind used for comic book preservation). Rest assured, I pack with care!