When Howard's grandfather offers him a shrinking machine that looks like a wrist watch, Howard wastes no time trying it out. Controlling his size with a dial on the machine, he eventually shrinks smaller than a cell. Photographs provide proof to youngsters of things not visible with their naked eyes, but the incorporated cartoonish Howard is distracting and more than a bit corny. As well, his appearances do not always fit the descriptions given, nor do the descriptions accurately relate proper proportions in the scales given. For example, on a page which illustrates Howard sailing through the air on a dandelion seed, roughly his length, the accompanying text indicates that a fruit fly "looked as big as an eagle to tiny Howard."
References to God's hand in creating the natural world support a Christian viewpoint that not all readers will appreciate. Stephen Kramer's Hidden Worlds: Looking through a Scientist's Microscope offers a more appealing alternative.