But seen this in practice is much more difficult. I can make good microscope slide from the Tulip. The Stoma are good visible.
But not an open and going closed stoma. I start with the cel in distilled water and later change the water for 10% NaCl solution.
What can I do to get best results in seen open and closed stoma in the same slide ?
Here a picture made with my smartphone through the microscope, that what I see in plain water, but with 10% NaCl it's nearly the same.
![Image](https://i.postimg.cc/Jt738D9k/IMG-1510.jpg)