CONTENTS. . IX 



Pages 

 hematochrome is not without analogy to the chlorophyl 



pigment. — Opinion of naturalists upon the physiological 

 function of the so-called ocular spots. — Observation of 

 M. Pouchet upon the eye of the Glenodinium polyphemus. 

 — This eye is composed of a pigmentary mass and of a 

 refringent body. — Observations of M. KUnstler upon the 

 • eye of Phacus. — Observation of Claparede and Lach- 

 mann. — Observation of Lieberkuhn. — Sensitiveness of the 

 Euglena to light. — Experiments of Engelmann. — The vesi- 

 cles of Miiller in the Loxodes rostrum 22-31 



II. 

 NUTRITION. 



Psychical phenomena connected with respiration. — Search 

 for oxygen by the bacteria of putrefied matter. — Observa- 

 tion of Engelmann 31-34 



THE PSYCHOLOGY OF NUTRITION. 



Psychical phenomena connected with nutrition. — Vegetable, 

 or holophytic, nutrition.— The chromatophores.— Structure 

 ot the chromatophores. — Coincidence between the presence 

 of an eye and that of chlorophyl pigment. — Comparison 

 between the Euglena and the Peraneina. — Nutrition by 

 endosmosis, or saprophytic. — Animal nutrition, choice of 

 nutriment.— Prehension of foods by the Amceba, the Actin- 

 ophrys, the Monas, the Acineta. — Opinion of M. Mau- 

 pas upon choice by preference. — Capture of food. — The 

 vorticel Ciliates. —The Hunter Ciliates. — The Amphileptus. 

 — The Didinium nasutum. — Movements of defense and 

 flight 34-55 



COLONIES OF UNICELLULAR ORGANISMS. 



Colonies of unicellular organisms. — Colonies of single-celled 

 organisms have their origin in the segmentations of a 

 mother-cellule.— Temporary) colonies which are formed 

 beneath the cuticle. —The Gonium. — The Eudoryna.— The 



