REPRODUCTION. 1 1 5 



77. Prepare a synoptical essay, of not over 300 words, 

 upon Growth, 



CORRELATED TOPICS. 



Ontogenetic unfolding of the higher plant, and factors deter- 

 mining assumption of form ; hereditary, direct, and irri- 

 table factors. 



Internal factors ; polarity, rectipetality, epinasty, hyponasty, 

 Sachs' curvature, correlations. 



"Vitality'' and its nature, particularly in seeds, and ''resting 

 periods. ' 



Grand periods, annual periods and rhythms. 



The cardinal points in growth, minima, optima, and maxima: 



rigors. 



Is temperature a 4t stimulus ' or a i4 condition ' in growth ? 

 Tissue tensions and their relations to growth, and assumption 



of form. 



Spontaneous movements of Desmodium, etc. 

 Contractility of roots, torsions, fasciations. 

 Growth in darkness: etiolation. 



LITERATURE. 



Darwin, C. Power of Movement in Plants. (Read at least 



the Summary.) 

 Anderson, A. P. The Grand Period of Growth in a Fruit of 



Cucurbita pepo, determined by Weight. Minnesota 



Botanical Studies, No. XXI, 1895. 

 Electro-culture. Nature, 61, 602. Also Stone and Kinney 



in Hatch Experiment Station Bulletin, No. 43, 1897. 



Section 3. Reproduction. 



The physiological phenomena connected with Reproduc- 

 tion, extremely important though they are, do not admit of 

 profitable experimental study in such a course as this. Some 

 of them have already been studied in your earlier courses; a 

 few are taken up under other sections, while others merge into 

 purely ecological investigations. It is necessary, however, to 



