1894 THE MICROSCOPE. 31 



resulting from the last negative it may readily be seen which 

 line is on top. 



Fats. — Nearly all fats are beautifully crystalline. To study 

 the crystals of different fats, I prefer a quarter inch objective. 

 Place a very small portion of the fat on a slide and press oat 

 into a thin film with the thin cover. Dr. Thomas Taylor's 

 method of examining butter with the polarizer is interesting. 

 Boil the butter a few minutes set away in a pill box or other 

 receptacle to cool. Fill a shallow cell with sweet oil. Put in a 

 small portion of the boiled and crystalized product, gently scat- 

 ter the granular crystals through the oil, place on thin cover, 

 and view with polarized light. Do not treat them roughly while 

 scattering as you would break up the crystals. I have treated 

 lard in the same way and produced crystals of the same rotund 

 form as butter crystals, but which exhibited a different cross 

 from the pure butter crystals. 



Stomata. — These organs of a leaf may be easily examined by 

 scraping a small portion of the cuticle, spreading it upon a slide 

 in a drop of any convenient fluid, covering and examining. 

 They may be seen with a low power but will a})pear best under 

 a quarter objective. 



SCIENCE-GOSSIP. 



Sectioning. — If you have never tried the " Bayberry Tallow" 

 method of sectioning loose tissues like lung and pancreas, you 

 have never succeeded in getting the most perfect mounts. 



Look Sharp. — " From a single and hasty view of bodies un- 

 der the microscope we are liable to form erroneous ideas of 

 form." 



RECENT PUBLICATIONS 



Pimny Bone. A Book of Alirth for Doctors, Druggists, Dentists, 

 Medical Stvdents and Others. St. Louis, JNIo., 1894. Price 50 

 cents. 



This is a book of caricatures and jokes which have been com- 

 piled from the medical journals, etc. Some of them are very 

 good. Over 150 of the illustrations are said to be original. 

 Whoever enjoys such things can afford to send 50 cents to the 

 Publishers, 1421 Market Street, St. Louis, Mo. 



