But chalk, when looked at under the microscope, betrays an organic origin.
"Geology"
James Geikie
On examining the cut in the strip with a microscope, it will be found that the edges are ragged and that there are little particles of silver lying about in the gap.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming
The microscope has done good service in the investigation of snake-poison.
"On Snake-Poison: its Action and its Antidote"
A. Mueller