Grades 6-8
Biology for Every Kid
In its segment on "Experiments that Teach Us About Ourselves: The Amazing Human Body" this book provides 35 experiments about the body (the other segments of the book are about plant and animal life. While certainly not a comprehensive anatomy course, the book does provide interesting and simple experiments (which can easily performed at home with fairly ordinary materials) that would provide a helpful supplement to the study of anatomy.
Heroes of Virtue
The Outlaws of Ravenhurst
The Cure of Ars
The Cure of Ars
Pyramid
Catholic National Readers: Book 6
This one contains stories like "King Solomn and the Bees", "Joan of Arc", and "Paul Revere's Ride" by Longfellow. This book does not seem to contain as many additional lessons like vocabulary.
Catholic National Readers
The Catholic National Readers were originally published in the 1890s by Benziger Brothers Publishing. They have been reprinted by Savio Books and Neumann Press in 1997 in hardcover editions. They are frequently compared to the McGuffey's Readers and are illustrated with charming pictures of the sort you'd expect to see in "antique" books.
Catholic National Readers: New Speller and Word Book
I am honestly not sure how to use this particular book. It does have spelling words and vocabulary. There are also lessons on Latin Roots, dictation, parts of speech (like synonyms) and abbreviations.