480 Editorial Notice. 



in aquaria with magnifying powers up to those given in the half 

 circle objective. It consisted of a vertical stem of one-inch brass- 

 tubing, about two feet long, supported by a heavy cast-metal foot. 

 In this stem a three-inch piece of tube slides, and is supported at 

 any height by a ring and pinching screw below it. This short slid- 

 ing table has another like piece attached to it, and rotating on an 

 axis at right angles to the vertical stem. Through this second 

 piece a tube, two fe3t long, slides horizontally, its best working posi- 

 tion being such that three-fourths of its length projects on one 

 side of the vertical stem, and the other fourth on the opposite. 

 To the shorter end of this horizontal tube a stem, carrying the 

 tube of the body of the microscope, is attached by a ball-and-soc- 

 ket joint, admitting of a coaase adjustment by a sliding tube, and 

 of a fine adjustment by acting on the long arm of the lever form- 

 ed by the transversely sliding tube to the end of which it is 

 attached. By this means the compound microscope is capable 

 of being flpplied to any part of the surface of the side of an aqua- 

 rium measuring two feet, or to the surface of the fluid which it 

 contains. The whole arrangement can be made by a gas-fitter 

 for the sum of about 2os., with sufficient accuracy for the uses for 

 which it was designed. Abundant illumination may be obtained 

 in cylindriform vessels by a small flat mirror let dov?n into the 

 aquarium, and moved into any position by wires, which can be 

 attached to it in a very simple manner. 



EDITORIAL NOTICE. 



The readers of the Journal are informed that each number of 

 the coming volume will contain a summary of Scientific Intelli- 

 gence, in which the various departments of Natural History will 

 be considered under their respective heads. 



