18 SEPTEMBER 1886, Page 22

careful description of elementary experiments such as would be needed

by students for the first part of Natural Sciences Tripes. The theory of the balance is fully worked out, and great attention is paid to thermometry and calorimetry, and a very good account of hygrometry is given. A good chapter is given to colour and polarised light each. There are experiments on acoustics and wave-lengths. Particular care is paid to exper:mental observations, corrections for error, and physical arithmetic. Altogether, a very accurate, in- teresting, and handy guide to laboratory work.