CONTENTS. 



PART I.— ON THE DENSITY OF OXYGEN. 



FIRST SERIES OF DETERMINATIONS. 



I. — Introduction ....... 



2. — Measurement of Capacities of Globes . 



3. — Preliminary Weighing of Globes . 



4. — Auxiliary Weights for Hydrostatic Weighings 



5. — Hydrostatic Weighing of Globes . 



6. — E.xpansion of Water and of Glass . 



7. — Solid Contents of Globes .... 



8. — Capacity of Globes 



9. — Compression of Globes when Exhausted 

 10. — Correction for Compression of Globes . 

 II. — A-ir-Pumps and Exhaustion .... 

 12. — Measurement of the Degree of Exhaustion Effected . 

 13. — Manipulation of Globes while Filling with Oxygen 



14. — Preparation of Oxygen 



15. — Purity of the Oxygen Obtained from Potassium Chlorate 

 16.— Measurements of Temperature and Pressure 

 i7._Balance Used in the First Series of Experiments . 

 18. — Verification of the Weights Employed .... 



19. — Results and Reduction 



PAGF. 



1 

 2 

 3 

 4 

 6 

 10 

 1 1 

 1 1 



14 

 16 



17 

 18 

 18 



19 

 21 

 22 

 28 

 30 

 31 



23-— 

 24.- 



25.- 

 26.- 

 27.- 

 28.- 

 29.- 

 30.- 

 3I-- 

 32- 



SECOND SERIES OF DETERMINATIONS. 



20.— Second Method of Determining the Density of Oxygen 

 21.— Standard of Pressure and Temperature . 

 22. — Desiccators for Holding Globes 



Drying the Air in the Desiccators . 



Filling Globes with O.xygen .... 



Balance Employed. Mechanism for Weighing by Reversal 



Weighing by Reversal 



Change of Surfaces of Globes 



■Preventing Leakage of Globes when Exhausted 



■Correction for Difference of Volumes . 



■Observations ..-.••• 



-Reduction of Observations .... 



-Results ...-•••• 



32 

 33 

 35 

 36 

 36 

 37 

 43 

 45 

 47 

 48 



49 



50 

 50 



