THE AXIAL GRADIENTS IN HYDROZON. 223 



If such a relation exists, the axial gradient is a gradient in physio- 

 logical condition, of which rate of fundamental metabolic reac- 

 tions is one feature. 



REFERENCES TO LITERATURE. 

 Child, C. M. 



'133 Studies on the Dynamics of Morphogenesis and Inheritance in Experi- 

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'i3b Studies, etc. VI., The Nature of the Axial Gradients in Planaria and their 

 Relation to Antero-posterior Dominance, Polarity and Symmetry. Arch, 

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'143 Starvation, Rejuvenescence and Acclimation in Planaria dorotocephala. 

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'i4b The Axial Gradient in Ciliate Infusoria. BIOL. BULL., XXVI. 



'153 Axial Gradients in the Early Development of the Starfish. Amer. Jour. 

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'i5b Senescence and Rejuvenescence. Chicago. 



'150 Individuality in Organisms. Chicago. 



'i6a Axial Susceptibility Gradients in the Early Development of the Sea Urchin. 

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'i6b Axial Susceptibility Gradients in Algae. Bot. Gaz., LXII. 



'i6c Further Observations on Axial Susceptibility Gradients in Algae. BIOL. 

 BULL., XXXI. 



'17 Susceptibility Gradients in the Hairs of Certain Marine Algae. BIOL. 

 BULL., XXXII. 



'19 Demonstration of the Axial Gradients by Means, of Potassium Permangan- 

 ate. BIOL. BULL., XXXVI. 

 Hyman, L. H. 



'16 An Analysis of the Process of Regeneration in Certain Microdrilous Oligo- 

 chetes. Jour. Exp. Zool., XX. 



'17 Metabolic Gradients in Amoeba and their Relation to the Mechanism of 



Amosboid Movement. Jour. Exp. Zool., XXIV. 

 Lund, Barbara L. 



'18 The Toxic Action of KCN and its Relation to the State of Nutrition and 

 Age of the Cell as Shown by Paramecium and Didinium. BIOL. BULL., 

 XXXV. 

 Lund, E. J. 



'i8a The Rate of Intracellular Oxidation in Paramecium caudalum and its Re- 

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'i8b Quantitative Studies of Intracellular Respiration. II., The Rate of Oxi- 

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'i8c Quantitative Studies on Intracellular Respiration. III., Relation of the 

 State of Nutrition of Paramecium to the Rate of Intracellular Oxidation. 

 Amer. Jour. Physiol., XLVII. 



