Van Leeuwenhoek's primary journals are found scanned within this 516 page eBook. For me, far aside from content... I would use this resource when coaching students on interactive science notebooks. His handwritten/drawn documentation is still a model today. To day we could use a digital camera, back then... he WAS a "camera." So cool.
This resource has several lessons consisting of short, on grade level readings, followed by questions. I would not use this in entirety but could see me pulling out Lesson 3-1 (What is a Beneficial Insect?), Lesson 3-2 (Predators), Lesson 3-3 (Pollinators) and Lesson 3-4 (Recyclers and Decomposers).