...We can only listen to our birds, and begin experimenting with those already possessed of shapely notes and voices of good quality... 
W. H. Hudson 「Birds in Town and Village」
...He is always experimenting,and will change his anvil for anotheras soon as he discovers one of superior resonance...
Fannie Hardy Eckstorm 「The Woodpeckers」
... I have been experimenting all along with big Volucella grubs, colored with the dirty red which comes with age...
J. Henri Fabre Alexander Teixeira de Mattos 「The Life of the Fly」
... It is time that we thought of experimenting...
J. Henri Fabre Alexander Teixeira de Mattos 「The Mason-bees」
... The Darwinian school will reply that they were hesitating, essaying, experimenting...
J. Henri Fabre 「More Hunting Wasps」
...I therefore made use, for the Philanthus, of the process of experimenting under glass which I roughly outlined when speaking of the Odynerus...
J. Henri Fabre 「More Hunting Wasps」
...Others were experimenting at the same time, among them Mr...
Henry H. Snelling 「The History and Practice of the Art of Photography」
...For those who do not care to go to the expense of experimenting with large plates, I would suggest that good contact positives be first made and from these negatives on bromide paper, Standard A, soft...
John A. Tennant 「Bromide Printing and Enlarging」
... The reader who can spend a Saturday afternoon with a few bromide prints, varying in character, will learn more from his experimenting than I could tell him in many pages...
John A. Tennant 「Bromide Printing and Enlarging」
...No, it might be amatter of days of experimenting in order to discover the elusiveswitch...
Various 「Astounding Stories of Super-Science, May, 1930」
...I can tune in on any mind in the world, by experimenting up anddown the vibration range to determine the susceptibility of theparticular person...
Various 「Astounding Stories of Super-Science, November, 1930」
...In the yard beyond the hangman was experimenting with the trap...
Various 「Astounding Stories of Super-Science, October, 1930」
...Forfifteen years I have been experimenting and constructing apparatus,with which I now have Earth at my mercy...
Various 「Astounding Stories of Super-Science, August 1930」
...It contains a miniature heat-generatorsuch as I was experimenting with recently in the Arizona desert...
Various 「Astounding Stories of Super-Science, August 1930」
...I learned their languages andcame to think of them as my own, and I found that many of theirscientific workers were experimenting along lines similar to thosewhich had brought disaster to Urtraria...
Harl Vincent 「Wanderer of Infinity」
...I let myself drift downward, experimenting...
Raymond King Cummings 「Wandl the Invader」
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