CONTENTS xiii 



APPENDIXES 



PAGE 



I. Chemistry of the primitive ocean 299 



II. Composition of deep-sea deposits 304 



III. Four Hensen net hauls in the Irish sea .... 305 



IV. Accuracy of quantitative plankton observations . . 306 

 V. Calculation of the coefficients of the quantitative 



PLANKTON NETS 313 



VI. Calculation of the age of the earth from the rate of 



DRAINAGE OF SALT FROM THE LAND 315 



VII. Bibliography 316 



Index 320 



