CONTENTS 



CHAPTER XXI PAGE 



Alkalies and Alkaline Earths 347 



Potassium . 348 



Sodium 350 



Lithium . . 354 



Calcium . . . . ... 354 



Barium 357 



Magnesium . 359 



Ammonia and Ammonium 360 



CHAPTER XXII 

 Acids 364 



CHAPTER XXIII 



Group of Haloids or Halogens 371 



Bromine . . . 371 



Chlorine 372 



Iodine .374 



Iodides . . 379 



Thyroid Gland .383 



CHAPTER XXIV 



Arsenic, Antimony and Phosphorus 385 



Arsenic . .... 385 



Antimony . 394 



Phosphorus . 396 



CHAPTER XXV 



