90 Scientific Intelligence. 



Composition of the Air at the Earth's Surface. 



Geocoroiriuni, (monatomic) 



Hydrogen, H 2 



Helium, He 



Water, H 2 



Neon, Ne 



Nitrogen. N 2 



Oxygen, O a 



Argon, Ar 



Cairbon dioxide, C0 2 



Ozone, 3 



Krypton, Kr. 



Xenon, X 



Mol. wt. 



abt 



0-4 



202 



4-0 



18-02 



20-0 



28-02 



32-00 



39-9 



44-0 



48-0 



83-0 



130-7 



Volume percentage. 



abt. 0-00058 (hypothetical) 



00033 (Gautier, Eayleigh) 



0-0005 (Claude) 



0—4, variable 



0-0015 (Claude) 

 78-06 (Leduc) 

 20-90 



0-937 



0-029, variable 



Traces (Thierry) 

 abt. 00001 

 abt. 0-000005 



Composition of the atmosphere in volume-percentage. 



Altitude 



Pressure 



(Geo- 



Hydro- 





Nitro- 







km 



mm 



coronium) 



gen 



Helium 



gen 



Oxygen 



Argon 







760- 



0-00058 



00033 



00005 



78-1 



20-9 



0-937 



20 



41-7 















85- 



15- 







40 



1-92 







1 







88 



10- 



— 



60 



0-106 



5 



12 



1 



77 



6 





SO 



00192 



19 



55 



4 



21 



1 





100 



0-0128 



29 



67 



4 



1 









120 



0-0106 



32 



65 



3 







— 





140 



0-00900 



36 



62 



2 



— 







200 



0-00581 



50 



50 



1 









300 



0-00329 



71 



29 











400 



0-00220 



85 



15 











500 



0-00162 



93 



7 











The author claims only roughly relative values for the quan- 

 tities given in the second table. — Zeitschr. anorgan. Chem., 

 Ixxv, 107. h. l. w. 



2. Allen's Commercial Organic Analysis. Vol. VI, Fourth 

 Edition, Entirely Rewritten. Edited by W. A. Davis and Sam- 

 uel S. Sadtler. 8vo, pp. 726. Philadelphia, 1912 (P. Blak- 

 iston's Son & Co.). — This volume deals with the organic bases, 

 and includes the following sections : Amines and ammonium 

 bases ; Other bases from tar ; Vegetable alkaloids ; Volatile 

 bases of vegetable origin ; Nicotine and tobacco ; Aconite alka- 

 loids ; Atrophine and its allies ; Cocaine ; Opium alkaloids ; 

 Strychnos alkaloids ; Chinchona alkaloids ; Berberine and its 

 associates ; Caffeine, tea and coffee ; Cocoa and chocolate. As 

 nearly twenty years have elapsed since the last edition of this 

 volume was issued, very far-reaching alterations have been neces- 

 sary in its revision. The book will be very useful to those inter- 

 ested in this branch of analytical chemistry. h. l. w. 



