492 GLOSSARY. 



Neurism, (growth-force) Bathmism, and (thought -force) 

 Phrenism."— Cope. (Pages 26, 61.) 



Bud-variation. Variation or modification from a type through 

 the agency of buds, as distinguished from variation through 

 seeds. (Page 89.) 



Catabolism. That kind or type of chemical change in organic 

 bodies which results in lesser or retrogressive complexity of 

 organization ; descending or destructive changes. Compare 

 Anabolism. (Page 348.) 



Cataclysm. Used in evolution writings to designate the as- 

 sumption (now mostly given up) that species have been 

 extinguished or created because of sudden physical changes. 

 Literally, the word means a flood or deluge. 



Catagenesis. Retrogressive or degenerate evolution ; modifica- 

 tion by loss of attributes or by simplification of structure. 

 First used by Cope in 1884. "Catagenesis is equivalent to 

 degeneracy and has played an important part in organic 

 evolution." — Cope. (Page 17.) 



Centrogenesis, a term proposed by the present author to des- 

 ignate the rotate or peripheral type of form assumed by 

 members of the plant creation. Compare Dipleurogenesis. 

 (Pages 16, 17, 18.) 



Communal intensity. An expression proposed by the writer to 

 designate the rapid spread of insects and fungi consequent 

 upon the greater number and extent of host -plants. 

 (Page 185.) 



Cultural degeneracy. An expression proposed by the writer 

 to designate the common assumption that plants become 

 weakened in constitution or virility by cultivation. (Page 335.) 



Development. There is a tendency amongst evolution writers 

 to restrict this word to tlie life-history, or ontogeny, of the 

 individual, in distinction from evolution or the history of 

 the race. See Evolution. "Development is that kind of 

 growth which takes place in a multicellular organism when, 

 by generation, a nucleated cell is set apart, protected, 

 nourislied, and by division and differentiation is elaborated 

 into a complex organism, without regard to the growth of 

 the parent — even at its expense, and when fully constructed 



