...No additional agreements, treaties,or stipulations can commit these States to the prohibition of theAfrican slave trade with more binding efficacy than those they havethemselves devised... 
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...They must feel, at the same time, the greater solicitudeto give the fullest efficacy to their ownregulations...
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...It is probable that he derived his knowledge from the natives as I did, and that the reputed efficacy of the balsam is owing to its fatty constituent...
David Livingstone 「Missionary Travels and Researches in South Africa」
...
With regard to the remedy of olive oil applied
internally, I should, myself, be disposedto doubt its efficacy unless M...
Abd Salam Shabeeny 「An Account of Timbuctoo and Housa Territories in the Interior of Africa」
...Their belief in the efficacy of sassy-wood to discover guilt or innocence, indicates a faith in an invisible Equity...
Horatio Bridge 「Journal of an African Cruiser」
...The little clouds of sand that issue at shortintervals from each cavity afford evidence of the efficacy ofthese implements and the industry of those that use them...
Douglas Dewar 「A Bird Calendar for Northern India」
... My personal experience confirms the efficacy of this rustic method...
J. Henri Fabre Alexander Teixeira de Mattos 「The Life of the Fly」
... We must also agree that her attitude when attacking, an attitude very different from that of the paralysers, is infallible in its death-dealing efficacy...
J. Henri Fabre 「More Hunting Wasps」
...I have been trying for along time to make a non-poisonous unction, but never fairlysucceeded; always had a doubt as to their efficacy, prejudice hadsomething to do with it...
Montagu Browne 「Practical Taxidermy」
...Butwhereas the efficacy of the Harvest-May is restricted to promotingthe growth of the crops, that of the May-tree or May-branch extendsalso, as we have seen, to women and cattle...
Sir James George Frazer 「The Golden Bough」
...No ceremony or taboo appears to be adopted in anticipation of proposed hostilities for the purpose of securing success; butindividual fighters often wear charms, upon whose efficacy they rely...
Robert W. Williamson 「The Mafulu」
...But the hoisting machine hasopportunities for usefulness which are greater and full of grandeur, andit is of the highest efficacy when used with intelligence...
Vitruvius 「Ten Books on Architecture」
...The public games or festivals of the Greeks wereprobably of greater efficacy in promoting a spirit of union thanany other outgrowth of the religions sentiment of Greece...
Marcius Willson 「Mosaics of Grecian History」
...It was called by the Romans, from the use made of it infabricating measures of weight, lapis æquipondus, and from itssupposed efficacy in the cure of diseases of the kidneys lapisnephriticus...
Hugh Macmillan 「Roman Mosaics」
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