...The care of a family must distract his attention and weaken his efficiency; and herein, it may be, consists one great advantage which the Catholic missionary possesses over the Protestant... 
Horatio Bridge 「Journal of an African Cruiser」
...His docility and mentalpliability exceed those of any other animal; his habits are social,and his fidelity not to be shaken; hunger cannot weaken, nor old ageimpair it...
Edward Jesse 「Anecdotes of Dogs」
...Everything that has a tendency to weaken theanimal, will be more or less liable to lead to rot...
Ambrose Blacklock 「A Treatise on Sheep:」
...A sow is capable of conceiving at the age of six or seven months; but itis always better not to let her commence breeding too early, as it tendsto weaken her...
Robert Jennings 「Sheep, Swine, and Poultry」
...Grubs weaken cattle, cause them to fall off in flesh and milk, and decreasethe value of the hide...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...after the nicotin solution isadded, as heat is liable to evaporate the nicotin and weaken the dip...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...During this time she may not approach ortouch a horse, for the Indians believe that suchcontamination would impoverish or weaken the animal...
Sir James George Frazer 「Balder The Beautiful, Vol. I.」
...Most flowers give out their coloring matter to alcohol or water--butthe former is found to weaken, and in some cases to dischargealtogether these colors; but they are in most cases restored in drying...
Henry H. Snelling 「The History and Practice of the Art of Photography」
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