485 



so determined do not correspond to definite compounds, probably 

 because an empirical formula is used instead of the immediate re- 

 sults of experiment. In conclusion, the author's results were briefly 

 stated thus : — 



1. The points of elevation, depression, or peculiarity in the curve 

 of condensation, denote definite compounds, whatever be the stand- 

 ard strength used. 



2. The use of varying the standard is simply to render such 

 points more prominent, or, in other words, to convert a point of 

 peculiarity into one of elevation or depression, as the case may be. 



The following Donations to the Library were announced : — 



First Report of the Committee on Beneficent Institutions (Medical 

 Charities of the Metropolis). 8vo. — From the Statistical Societj/ 

 of London. 



Journal of the Statistical Society of London. Vol. XX., part 1. 

 8vo. — From the Society/. 



The Canadian Journal, January 1857. — From the Canadian Insti- 

 tute. 



Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften. 

 Mathematisch-naturwissenschaftlichen Classe, Band XX. heft 2 

 und 3; Band XXI. heft 1 und 2. Philosophisch-IIistorische 

 Classe, Band XX. heft 2 und 3; Band XXI. heft 1 und 2. Re- 

 gister zu den zweiten 10 Banden. 8vo. — From the Imperial 

 Academy of Vienna. 



Denkschriften der Kaiserlichen Akademie der Wissenschaften, Wien. 

 Philosophisch-Historische Classe, Siebenter Band. 4to. — From 

 the Imperial Academy of Vienna. 



Tageblatt der 32 vcrsammlung Deutscher Naturforscher und Arzte 

 in Wien ini Jahre 1856. Nos. 1-8. 4to. From the Imperial 

 Academy of Vienna, 



Publications of the Koniglisch Sachsische Gesellschaft der Wissen- 

 schaften, Leipzig, viz. : — 



Beitrage zur Kenntniss der Gefasskryptogamen, von Wilhelm 



Hofmeister. 8vo. 

 Die Urkundlichen quellen zur Geschichte der Universitat Leip- 

 zig in den ersten 150 jahren ihres bestehens, von Friedrich 

 Zarncke. 8vo. 

 ror. 7ir - B, 



