2o6 THE MICROSCOPE. 



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A new edition of Hogg on the Microscope is just issued. 



Gold-chloride is a valuable reagent in the study of cartilage. 

 It dyes the cells violet without causing the protoplasm to shrink. 



The "Jumbo" microscope, made in 1851, owned now by Mr. 

 Crisp, of London, weighs i|- cwt., and the body tube is 4 inches in 

 diameter. 



Kleinenberg's Fluid. — Used for instantly killing small 

 zoological specimens: 



Picric acid (saturated solution in distilled water), 100 volumes. 

 Sulphuric acid (concentrated) . . . 2 " 



Tit, But Not Tat. — If any one is so wicked as to poison his 

 grocer, who brings him food every day, the severest penalty of the 

 law would be enforced, but if your grocer poisons you by adultera- 

 ting your food, ten chances to one no notice will be taken of it. — 



Chlorinated Soda. — A solution of this is made as follows: 

 To a pint of distilled water add two ounces of fresh chloride of 

 lime, shake thoroughly, then slowly add it to a saturated solution of 

 common washing soda until it becomes thick and turbid; let it 

 stand until thoroughly settled, when the clear liquid should be 

 taken off with a siphon, when it is ready for use. It should be kept 

 tightly corked in a dark place. 



Vaccinal Micrococci.- -The Lancet says that M. Straus has 

 plainly demonstrated the presence of the special micrococcus in micro- 

 scopical preparations of the vaccinal pustule from the calf. He 

 places the excised fragments of the skin in absolute alcohol, cuts 

 sections and stains them with methylamine violet, and then discolors 

 them, until only the nuclei, the bacteria and micrococci remain 

 visible. Under a strong magnifying power, the latter were visible, 

 as extremely minute points tinted blue, about a thousandth part of a 

 millimetre in diameter, and grouped in colonies. 



To Destroy Bacilli. — Prof. Herr R. Koch has been trying to 

 discover what are the best means to destroy the spores of bacilli, 

 how they behave toward the microphytes most easily destroyed, and 



