Many homeschoolers feel unprepared to teach science. I believe that this is in large part because they have no idea where to obtain the materials necessary to teach labs. I have dealt with two very large companies, who although their primary purpose is to supply schools, will sell to individuals. However, neither one will sell either chemicals or live bacteria and viruses. These two are: Ward Science Supplies and Carolina Biological. Don't be fooled by the name. Both sell materials to teach: biology, geology, meteorology, astronomy, chemistry, and physics from kindergarten through graduate school. A third company, Home Science Tools, sells primarily to homeschoolers. They will provide chemicals in the very small quantities that a homeschooler would wish. They also have many wonderful kits for teaching chemistry concepts.
The Double Helix: A Personal Account of the Discovery of the Structure of DNA by James D. Watson - I was very glad that he discussed the importance of the work done by Rosalind Franklin who, unfortunately, died before Watson and Crick received the Nobel Prize. This Prize is never awarded posthumously.
King Solomon's Ring by Konrad Lorenz - This is a truly hilarious book about the things that happen when humans attempt to study animals in as natural a setting as possible.
Curious Naturalists by Niko Tinbergen
The Origin of Species by Charles Darwin
Panda's Thumb by Steven Jay Gould
Hen's Teeth and Horse's Toes by Steven Jay Gould
The Flamingo's Smile by Steven Jay Gould
The Mismeasure of Man by Steven Jay Gould
Eight Little Piggies by Steven Jay Gould
Dinosaur in a Haystack by Steven Jay Gould
Bully for Brontosaurus by Steven Jay Gould
The Richness of Life by Steven Jay Gould
Ever Since Darwin by Steven Jay Gould
Time's Arrow/Time's Cycle by Steven Jay Gould