CHAPTER XIX. 



HETEROGENESIS IN HIGHER ORGANISMS. 



Nature of Life in Subordinate Living Units. M. Turpin on Milk 

 Globules. Their Conversion into Fungus-germs. Heterogenesis in 

 higher Plants. M. Trecul's observations. Conversion of Crystal- 

 line Masses into Living Germs. These processes free from un- 

 certainty. ' Muscardine ' of Silk-worms. Its Nature and Mode 

 of Origin. Views of M. Guerin-Meneville. Empusa in Flies. 

 Prof. Cohn's views as to Mode of Origin of. Germ Theory of 

 Disease. Different Interpretations of Facts. Development of 

 Bacteria in Blood of Man. Their Modes of Origin. Vegetable 

 ' Blights.' Views of older Botanists. Presence of Independent 

 Organisms within interior of Plants. Similar Organisms discover- 

 able within Animal Cells. Heterogenetic Developments of their 

 Granules. Mode of Origin of Bacteria in Epithelial Cells. Abun- 

 dance of Organisms upon Mucous Membranes. Vegetal Parasitic 

 Diseases of the Skin. Possible Modes of Origin. Presence of 

 Fungi upon and within internal tissues of Animals. ' Pebrine ' 

 in Silk-worms. Presence of Psorosperms. Their Nature and 

 Modes of Origin. Spread of the Disease. 



Mode in which Panspermists explain above-mentioned Facts. No 

 independent Evidence in favour of their Views. Theory of Con- 

 tagion. Similar influence of living and not-living Contagia. 

 Contact-action versus direct Multiplication. Evidence in favour 

 of Contact Theory. M. Davaine's Experiments. Other similar 

 Evidence. Origin and Spread of Local Parasitic Diseases. Inocu- 

 lation Experiments. Inconsistencies of Evolutionists in adopting a 

 Panspermic Doctrine. 



WHEN the functional processes in organs have 

 come to an end in dead animals and plants, 

 there gradually supervenes throughout the body a cessa- 



