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adjustment animals associations aurora average botany causes cell constancy cell division character CHART child chromatin chromosomes cleavage cells culture defects determined differentiation products disjustive dwarfs earth earth's magnetic effect electrons environment epithelial cells equal experience extermination factor fauna fecundity formed geographical poles geography germs grow growth high school human increase individual intellect invention laboratory larger less lines of force live magnetic field magnetic poles ment mental metaplasm molecule morality motor coordinations muscle cells normal nuclear size nucleus nucleus-plasma ratio number of cells observed organs ovum Paramecium pellagra phenomena photographed physical plasm polarity pressure products of differentiation proto protoplasm Protozoa reading region rejuvenescence relation relatively result rotating rotifer school sciences selective breeding senescence senile sensory sequence shown social solar atmosphere spectroheliograph spermatid spermatozoa stages substance sun-spots tion traits velocity vortex yolk Zeeman effect