SCIOPTICON MANUAL. 



87 



MISCELLANEOUS EXPERIMENTS. 



THE SCIOPTICON TANK (Fig. 28) is free from projecting 

 clamps and so passes freely upon the stage in front of 

 the condenser. It serves as a dry cage for insects, &c., 

 a cell to show liquids and life in*water, a tank for the 

 exhibition of chemical reactions, and with wires pro- 

 tected and bent over the ends it can be used in connec- 

 tion with a galvanic battery. It is the most convenient 

 for the preceding experiments, as well as for these 

 which follow. 



Fig. 28. 



COHESION FIGURES. The cohesion figures known as 

 Tomlinson's are both interesting and beautiful, and can 

 be shown as follows : Fill the tank to within half an 

 inch of the top with alcohol and slide it into place upon 



