Transcriber’s Notes: Underscores “_” before and after a word or phrase indicate _italics_ in the original text. Small capitals have been converted to SOLID capitals. Typographical and punctuation errors have been silently corrected. The symbol “ī” (small i with macron)was used in place of the numeral 1 (one) with macron. The symbol “̅2” (overline + 2) was used in place of numeral 2 with macron. Determination of The Atomic Weight of Cadmium and The Preparation of Certain Of Its Sub-Compounds. Dissertation, Presented to The Board of University Studies of The Johns Hopkins University, For The Degree of Doctor of Philosophy, By Harry C. Jones 1892. _Contents._ Page Determination of the Atomic Weight of Cadmium 1 Introduction and Historical Statement 2 Preparation of Pure Cadmium 22 The Preparation of Pure Nitric Acid 28 The Arrangement of Crucibles 30 The Mode of Procedure 32 The Weighing 37 Taring the Crucibles 40 The Results 42 Objections to the Method 45 Advantages of the Method 48 The Oxalate Method 50 Preparation of Pure Oxalic Acid 51 Preparation of Cadmium Oxalate 52 Mode of Procedure 53 The Drying and Weighing of the Oxalate 55 The Results 58 Advantages of the Method 60 Disadvantages of the Method 61 Preparation of Certain Sub-compounds of Cadmium 63 Historical 64 The Preparation of Cd₄Cl₇ 66 The Preparation of Cd₄Br₇ 78 The Preparation of Cd₁₂I₂₃ 82 The Preparation of Cadmium Hydroxide and Oxide 82 Notes on Crystals of Metallic Cadmium 97 The Cohesion Phenomena of Cadmium 103 Biographical Sketch 106 Acknowledgment.