Chemistry and Physics. 58 
inactive tartrate, as Pasteur had shown to be the case with that 
made from the commercial succinic acid. The inactive acid was 
then converted into racemic acid, and this, by Pasteur’s process, 
was changed into potassio-sodium tartrate. ‘Two sorts of crystals 
were produced; one, hemihedral to the left, identical with the 
the dextro-acid, and yielding a dextro-rotatory solution whos 
° 3’ against 6° 4’ for the perfectly 
pure natural salt.— C. R., lxxvi, 286, Feb., 1878 G. F. B. 
On the Synthesis of Tyrosin.—Lapensure has shown that 
sealed tube—is not identical, but only isomeric with tyrosin.— 
Ber. Berl. Chem. Ges., vi, 129, Feb., 1873. Go 
8. A Treatise on Electricity and Magnetism ; by James CLERK 
D., ete. Professor of Experimental Physics 
verification b ual measurement. is designed to supply 
what the various treatises which describe electrical and magnetic 
phenomena in a pop way do not give to those who are, by 
in a mathematical form. or states that he 
commenced the study of electricit first reading attentively 
Faraday s Experimental Researches on Electret ore 
