COLLATERAL READINGS SUGGESTED 

 IX CONNECTION WITH ESSAY V. 



Darwin's Origin of Species; Variations of Plants and Animals 

 under Domestication; Climbing and Insectivorous Plants; How Or- 

 chids are Fertilized; Cross and Self- Fertilization; Earth Worms 

 and Vegetable Mould; Gray's Darwiniana, and How Plants Grow; 

 Nicholson's Palaeontology; LeConte's Geology; Grant Allen's Evo- 

 lutionist at Large, and Colors of Flowers; Haeckel's Creation; Hux- 

 ley's Physical Basis of Life, Lay Sermons, and Lectures on Evolu- 

 tion; Spencer's Spontaneous Generation; Wallace's Island Life, and 

 Tropical Nature; Clarke's Mind in Nature; Bastian and Tyndall 

 on Spontaneous Generation; Powell's Our Heredity from God; Daw- 

 son's Geological History of Plants. 



