...Abstract questions of physics and chemistry he did better on; but theactual quantitative problems, which they expected him to solve in hishead, stumped him completely... 
Various 「Astounding Stories, August, 1931」
...Then he saw him in the beer gardens with his friends, discussing metaphysical problems between business conversations...
Vicente Blasco Ibanez Charlotte Brewster Jordan 「The Four Horsemen of the Apocalypse」
... In coming into the hands of the Committee he needed no persuading to go to Canada; he was occupied with two interesting problems, to go back or to go forward...
William Still 「The Underground Railroad」
... Spiller: Inter-Racial Problems, p...
W.E.B. Du Bois 「The Negro」
...Under this last mentioned solution of the Negro problems wemay put the attempts at the segregation of Negroes and mulattoesin the United States and to some extent in the West Indies...
W.E.B. Du Bois 「The Negro」
...On the contrary, I deem it a privilege to be permitted tolive in an age when great, serious, and perplexing problems are to bemet and solved...
Booker T. Washington 「The Negro in the South」
...This seems a sufficiently complicated life-history to suitthe most persistent solver of puzzle problems, but there isan additional factor which adds much to the possible confusionof the broods...
Clarence M. Weed 「Butterflies Worth Knowing」
...The application of serological techniques to the problems ofanimal relationships has been attempted with varying degrees ofsuccess over a period of approximately fifty years...
William B. Stallcup 「Myology and Serology of the Avian Family Fringillidae」
...One of the problems met early in this investigation was instabilityof the proteins in the extracts that were prepared...
William B. Stallcup 「Myology and Serology of the Avian Family Fringillidae」
...How many orders, dangers, prohibitions, problems, enigmas has one not toclassify in one's overburdened memory!...
Maurice Maeterlinck Alexander Teixeira de Mattos 「Our Friend the Dog」
...Was it surprising that Pelléas oftenappeared pensive in the face of those numberless problems...
Maurice Maeterlinck Alexander Teixeira de Mattos 「Our Friend the Dog」
...I put some problems to it verbally and was able to satisfy myself as to its abilities in the matter of arithmetic...
Henny Kindermann Agnes Blake 「Lola」
...Fräulein Kindermann further applied her tests systematically in order to solve certain problems, proving the animal's ability to the full extent in one particular subject at a time...
Henny Kindermann Agnes Blake 「Lola」
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