Imagine you collected a liter of water from a pond.

How are samples loaded into and removed from microscope?

You could use a pipette to load a drop at a time. Could you fill a syringe and squirt samples into the microscope?
Or automatically load samples with an electric pump using Arduino? Is there a way to monitor your sample automatically? Any other ways you could automate or augment analysis (i.e. Using a servo to keep the sample in view using image processing, or immersing a contact microscope in a large tank for continuous monitoring)?