CONTENTS 



CHAPTER I 



PAGE 



INTRODUCTORY i 



CHAPTER II 



THE HIGH MAGNIFICATION CRESCOGRAPH 



Necessity for shortening the period of experiment — The Optical 

 Lever — Automatic High ]\Iagnitication Crescograph — Automatic 

 record of rate of growth — Oscillation Method for elimination of 

 friction in record — Time-relation of response obtained from dotted 

 record — List of specimens with average rate of growth — The 

 Stationary and the Moving Plate Methods — Determination of 

 absolute rate of growth — Effect of variation of temperature — 

 Precaution against physical disturbance — Pulsation in growth — 

 Magnification of fifty million times by Magnetic Crescograph . 5 



CHAPTER III 



THE BALANCED CRESCOGRAPH 



Principle of the Method of Balance — Method of Compensation by 

 Falling Weight — Method of Compensation by Inclined Plane — 

 Scale for measurement of absolute rate of growth — Formula for 

 determination of absolute rate of growth by Method of Inclined 

 Plane — Experimental verification of formula — The Time-Factor 

 — Effect on growth of duration of the application of carbonic acid 

 gas . . . . . . . . . . .22 



CHAPTER IV 



EFFECT OF VARIATION OF TEMPERATURE ON GROWTH 



Error arising from sudden variation of temperature — Thermal 

 regulator for gradual change of temperature — Determination 

 of cardinal points of temperature — The temperature optimum — 

 The temperature minimum — Contractile death-spasm at 60° C. 



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