64 THE MICROSCOPE. [April. 



brown, the latter being also colored red with phoroglucin (i gram 

 in 20 c. c. of alcohol and So c. c. of distilled water) and strong 

 hvdrocholic acid, and yellow with anilin chloride (2 grams in 



65 c. c. of alcohol. 35 c. c. of distilled water, and 2 c. c. of strong 

 HC1). Hoffmann's blue or eosin is specially useful for dis- 

 tinguishing sieve areas.* 



Gum Thus. — Gum thus, or frankincense, is obtained from the 

 tree of the pine. I procure it from the L. R. Barnard Chemical 

 Co.. dealers in dye-stuffs, chemicals, acids, oils, etc., at 58 Market 

 street. Newark. N. J. I dissolve it in commercial alcohol with 

 moderate heat, and then pour it off from the sediment. To this, 

 three parts. I add one part of oil of cinnamon. It is used like 

 Canada balsam, but dissolves in weak ammonia, alkali, carbonate 

 of ammonia, soda or potash or borax. These, can be used to 

 clean the slides from superabundant medium. Those who have 

 tried it speak in flattering terms of it. It is of a high refractive 

 index, makes diatoms come out well with an ordinary one-fifth, 

 and resolves the Amphipleura pellucida with a one-twelfth 

 immersion. The color, lightish brown, is bad, but I will bleach 

 it by and by. Cholorine does not bleach it well. — Arthur M. 

 Edwards, M. D., Newark, N.J. 



RECENT PUBLICATIONS, 



Medical Microscopy. By Frank J. Wethered. 121110. Phila, 

 delphia. P. Blakiston, Son & Co., 1892. pp. 406- 

 cuts 101 . 

 A book so clear and consise as this, so compact and so essen- 

 tial to the practitioner, ought to sell by the hundred thousand. 

 How a physician of to-day can practice medicine intelligently 

 without using a microscope continually passes our comprehen- 

 sion. The examination of urinary deposits, of faeces, of sputum, 

 of vomit, of blood, of genital discharges, of cutaneous parasites, 

 of suspected food and water, not to mention tumors, tissues, 

 and nerves are all necessary to a proper understanding of the 

 cases daily presented to the physician. What can be seen with 

 the microscope and how to see it are fully set forth by the 

 author. Of elementary microscopy, there is perhaps enough to 

 enable the novice to begin the use of an instrument. There are 

 chapters on hardening and decalcifying, on imbedding, on cut- 

 ting sections, on staining, on clearing and mounting, on the con- 

 struction and use of microscopes and accessories. Bacteriology 

 gets a chapter at the end of the volume. We hope to arrange to 

 furnish this book to our subscribers at a reduced rate. 



* Schulze's solution : prepared by evaporating ioo c. c. ofliq. zinci-chlor. B. P. to 70 c. c. and 

 dissolving in it 10 grams of potassium iodide. Add 0.2 gram of iodine and shake frequently 

 until saturated. 



