Dearborn, A Laboratory-Course in Physiology Based on Daphnia etc. 2< S T 



ilege, it is our duty, in order that many minds, many more than 

 at present, may each contribute its possible mite to the advance- 

 ment of biologic learning. Moreover it is part of the intelligence- 

 birth-right of every human being to understand how lie is con- 

 structed as a mechanism and how this mechanism works. Only 

 thus can he give his body, at once trainer, temple, and servant of 

 his soul, fit and necessary care. This present work is a step, 

 however short and shuffling, toward this great end. 



The standing of this pioneer endeavour as a pedagogic proposi- 

 tion, as a scientific method, we may attempt to justify at the 

 present writing under six heads. The first of these heads we may 

 suggest as the substantiality and the variety of the phys- 

 iologic principles that can thus be studied. Remembering, 

 if the reader please, that this is a first ,. edition" and therefore 

 tentative and suggestive only, we may venture to quote a syllabus 

 of the work already arranged, as follows: 



A Laboratory Course in Physiology Based on Daphnia, etc. 



I. Introduction: Vegetal and Animal Histology. 

 II. Comparison of Living Vegetal and Animal Cells: 

 Bacteria, desmids, diatoms, Edeogonium, Spirogyra, Euglena, 

 ciliated infusoria. 



III. Protoplasm and its Streaming: Ameba. Surface- 

 tension. Universal versatility. 



IV. Locomotion by Cilia: Paramecium, Stentor. 



V. Simple Forms of Muscle: Hydra, Stentor, Vorti- 

 cella. 



A. The reaction-time of Stentor's or of Vorticella's myo- 

 nemes. 



B. The relaxation-time of Stentor's or of Vorticella's 

 myonemes. 



C. The spontaneous contraction-rhythm of Vorticella. 



D. Fatigue in Vorticella's myonemes. 



E. Exhaustion in Vorticella's myonemes. 



F. Individual differences in the movements of Stentor 

 and of Vorticella. 



VI. The Molar Movements of Simple Metazoa: Hydra, 



the rotifers Philodina, Brachionus. 

 VII. Dessication and Re-humidif ication : Tardigrada, 



Philodina. 



VIII. The Anatomy, Gross and Microscopic, of Daphnia. 

 IX. Nutrition: Daphnia. 



A. The water-currents toward the mouth. 



B. Deglutition. 



