...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」
...We must alwayskeep in mind that accomplishments and inventions which seem so simple tous were new and unsolved problems to the pioneers who worked their wayup from a simian to a human estate...
Peter Nielsen 「The Black Man's Place in South Africa」
... Von Luschan: in Inter-Racial Problems, p...
W.E.B. Du Bois 「The Negro」
...What do Negroes themselves think of these their problems andthe attitude of the world toward them? First and most significant,they are thinking...
W.E.B. Du Bois 「The Negro」
...
*Papers on Inter-Racial Problems Communicated to the First UniversalRaces Congress, etc...
W.E.B. Du Bois 「The Negro」
...Zora realized how human they were, and how like their problems were to hers...
W. E. B. Du Bois 「The Quest of the Silver Fleece」
... of the main problems as regards the education of the Negro is howto have him use his education to the best advantage after he hassecured it...
Booker T. Washington 「The Future of the American Negro」
...This migration resulted in two things: in the increase andintensification of the problems of the city, and in redoubled effortto keep the Negro laborer on the plantations...
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」
...One of the major problems in comparing the data on toxicity of venom in studies of this type is that no standard method of estimating toxicity has been used...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...Four papers on the application of statistical methods to herpetological problems...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...The precipitin reaction, however, has neverbeen applied to actual problems in avian taxonomy prior to thepresent study...
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」
...As the problems always took me longer than they did her I never checked them at the time, but went over them later, after she had given all her answers...
Henny Kindermann Agnes Blake 「Lola」
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