...Intangible shadowyforms seemed to be taking shape within a swirling maze of ethereallight that hummed and crackled with astounding vigor... 
Various 「Astounding Stories, August, 1931」
... His vigor as a tireless centaur had helped him powerfully in his task of populating his lands...
Vicente Blasco Ibanez Charlotte Brewster Jordan 「The Four Horsemen of the Apocalypse」
...He dressed himself joyfully, with anervous excitement that seemed to augment the vigor of his arms andlegs...
Vicente Blasco Ibáñez Frances Douglas 「The Blood of the Arena」
...Their fear, which I seldom could allay, made them, when addressed, clap their hands with increasing vigor...
David Livingstone 「Missionary Travels and Researches in South Africa」
...This hour he glows in the blush ofhealth and vigor, but the next, he may be counted with the number nomore known on earth...
William Wells Brown 「Clotelle: a Tale of the Southern States」
...The most "prosperous" industrial period makes it impossible for theworker to earn enough to keep up health and vigor...
Emma Goldman 「Anarchism and Other Essays」
...Exceptions to this rule may be made, when greater sizeis required than can be obtained from the female, and especiallywhen more vigor and hardiness of constitution are desirable...
Richard L. Allen 「Domestic Animals」
...The last are sometimes allowedto come in with a lamb at a year, but they cannot besustained in vigor if put to breeding before two...
Richard L. Allen 「Domestic Animals」
...Every year shouldadd to the vigor of the selection...
Robert Jennings 「Sheep, Swine, and Poultry」
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