58 THE MICROSCOPE April 



QUESTIONS ANSWERED. 



NoTB. — Dr. S. G. Shanks, of Albany, N V., kindly consents to receive all sorts of (/ues- 

 tions relating to microscopy , whether asked by professionals or amtiteurs. Persons if at. 

 fades of experience, frotn the beginner upioatd, are welcome to the benefits uf this d^pn' ' 

 ment. The questions are numbered for future teference. 



Does the binocular 7)iicroscope excel the monocular Jorm in ease 

 of I'islon or clearer image? Would a binocular statid at $90.00 or 

 $98.00, be too cheap to give satisfaction? — E. N. H. 



The binocular microscope is inferior to the monocular form for 

 ease of visi(»n and for clear images. The single image formed 

 by the single objective is divided by the binocular prism, 

 with a loss of light and of definition. Course objects, like sand 

 or shells, stand out in pretty, stereoscopic relief but, good defi- 

 nition requires a clear, straight tube, which can be had in the 

 binocular form by sliding back the prism in the nose piece 

 or bottom of the tube. A binocular stand at $90.00 ought to 

 be satisfactory. 



PRACTICAL SUGGESTIONS. 



BY L. A. WILIvSON, 



CIv^VSl^AND, OHIO. 



How to See Trichina in Raw Pork.— We have often, in 

 these pages suggested that the microscope, as its name implies, 

 is for the observation of little things. A few evenings since, an 

 amateur brought a piece of trichinous pork which he had placed 

 on a glass slip and covered. He had placed a comparatively 

 small piece on the slide. The trichina were visible but were 

 dim and hazy. Upon lifting the cover, and picking out a piece 

 of a single muscular fibre, removing the rest of the meat ; cover- 

 ing the particle of single fibre, and pressing it out thin with 

 the finger on the cover, the trichina? in their cysts were plainly, 

 clearly, and beautifully visible. Examined with a quarter-inch 

 objective they were still plain, and all the details of the para- 

 site could be ])lainly and satisfactorily observed. 



