168 BIOLOGY: GENERAL AND MEDICAL 



in this regard it is easy to fall into error for in man we 

 find the taste an unsafe guide, many things not pleasant 

 to the palate being serviceable for food and some that 

 taste quite agreeably being injurious or even poisonous. 

 It may be, therefore, that taste is not a common sense, 

 and that other means of discriminating between useful 

 and useless things are provided. However this may 

 be, when the sense exists there must be specialized nerve 

 endings to be impressed, fibres to convey these impres- 

 sions to the brain, and centres where they are to be 

 received and retained or utilized, and the fact holds 

 good that with each sense the general complexity of the 

 central nervous system is increased. 



REFERENCES. 



THOMAS H. HUXLEY: "Anatomy of Invertebrated Animals," 



N. Y., 1885. "Anatomy of Vertebrated Animals," 



N. Y., 1886. 

 W. T. SEDGWICK AND E. B. WILSON: "An Introduction to 



General Biology," N. Y., 1895. 

 A. S. PACKARD: "Zoology" N. Y., 1895. 

 A. T. MASTERMAN: "Elementary Text-book of Zoology," 



Edinburgh, 1902. 



T. W. GALLOWAY: "First Course in Zoology," Phila., 1906. 

 ANTON KERNER VON MARILAUN: "The Natural History of 



Plants." Translated by F. W. Oliver, N. Y., 1894. 

 E. STRASBURQER, F. NOLL, H. SCHENCK, AND G. KARSTEN: "A 



Text-book of Botany," translated by W. H. Lang, N. Y. 



and London, 1908. 

 J. Y. BERGEN AND B. M. DAVIS: "Principles of Botany," N. Y., 



1906. 

 T. J. PARKER: "Lessons in Elementary Biology," London, 1893. 



