18 96.J MICROSCOPICAL JOURNAL. 103 



brass tube, k, to it, first interposing a stiffening piece of a suffi- 

 cient thickness to bring the mirror's centre line true to centre 

 line of lenses. Then solder the whole together neatly, the rivet 

 serving to hold in position. The piece k is then sprung onto 

 the stem, i, where, if properly fitted, it will hold the mirror in 

 whatever position placed. To ensure this, the piece should be 

 cut from a tube a little smaller in diameter than the stem, i, 

 and put on a mandrel and well planished on the outside with a 

 hammer-nose or planisher ; then it will hold admirably, and 

 may be slipped off or on at will. 



The slot, p, is also very handy for attaching the arm of a con- 

 denser or a candle-holder for night work. All essential meas- 

 surements may be taken from the scale. The under side of 

 stage, and that portion cff its upper surface beyond the glass 

 slides, should be coated with a dull black, and if the stand, up- 

 right, and arm are painted with a dark enamel paint, the whole 

 thing will have a very neat appearance. 



Care must taken in staining the stand upright, etc., not to set 

 up cross reflections that would confuse the light on the field, 

 and care must also be exercised to get the field hole in stage 

 coincident with axis of microscope. If the stand is made of 

 brass, it should be cleaned up nicely and bronzed. — Work. 



MICROSCOPICAL MANIPULATION. 



Preparing the Ovaries of Scilla patula. — Miss Lily H, 

 Huie finds that the best method for preparing the ovaries of S. 

 patula, in order to demonstrate the protein crystalloids, is by 

 first fixing in Mann's Watery Corrosive Fluid. " To a boiling 

 0.75 per cent, common solt solution, sublimate is added to satu- 

 ration (12 grm. for 100 cc). The solution is then allowed to 

 cool, when crystals of sublimate make their appearance. Pre- 

 serve the solution without decanting. — M. Heidenhain. 

 Martin Heidenhain's corrosive sublimate 



solution . . . . 100 cc. 



Picric Acid .... 1 grm. 



Tanaic Acid .... 1 grm. 



" The tissues were carefully dehydrated and taken through 



chloroform into paraffin, and serial sections cut not thicker 



