478 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
For comparative observation of absorption spectra .of various solu- 
tions it is best to use Zeiss’ double absorption vessels. The manage- 
Fig. 85. 
ment of the instrument is easy and remarkably convenient, and its great- 
feature is its adaptability with even relatively unfavourable light. 
C6) Miscellaneous. 
i New Thermo-Regulator.* — Dr. F. G. Novy Las devised a thermo- 
regulator which can be used for high as well as low temperatures. Fig. 
* Journ. Applied Microscopy, i. (1898) pp. 91-2 (2 figs.). 
