380 Scientific Intelligence. 
The subject of Mendelejeff’s paper is: “The periodical law of 
the Chemical elements.” Under this head he discusses the follow- 
ing subjects : 
(1.) The nature of the periodical law. 
(2.) On the application of the periodical law for the purpose of 
systematizing the elements. 
(3.) Application of the periodical law for the purpose of deter- 
mining the atomic weights of elements which have not been 
studied exhaustively. 
(4.) Application of the periodical law for the purpose of deter- 
mining the properties of undiscovered elements. 
(5.) On the application of the periodical law for the purpose of 
correcting atomic weights determined by other means. 
( n the application of the periodical law for the purpose of 
enlarging our knowledge of chemical structural forms. 
The same subject, further, has also been fully discussed from 
1 both in the Annalen der 
Chemie und Pharmacie (VII Supplement, 8. 354), and in his work 
entitled: ‘ Die modernen Theorien der Chemie.” i 
In a work by H. Baumhauer (“ Die Beziehungen zwischen dem 
Atomgewichte und der Natur der chemischen Elemente”) another 
exhaustive discussion of the e subject ma foun pee 
Mr. Hodges appears to have overlooked the above-mention 
memo : 
12. Compressibility of Carbonic Acid.—Dr. ANDREWS, ID 4 
Society, gives a continuation 
his well known paper published in 1869, “On the Continnity 0 
the Liquid and Gaseous States of Matter.” A series of accurate 
m 
easurements have been made of the correspon temperat ? 
pressure and volume of carbonic acid; to test the epee he 
the laws of Boyle, Gay Lussac and to The appara 
before compression. The lower 
ing the gases dip into small mercurial reservoirs formed o! ¢ = 
lass tubes, which rest on ledges within the apparatus. ea 
leather washers used in packing the fine screws are now onic 
with grease by heating them im vacuo under melted lard. ze 
air enclosed in the pores of the leather was thus removed witho 
the aid of water. This packing has never been known to fail m 4 
