The Microscope. 191 



Oration Delivered Before the Alumni Association of the Medico- 

 Surgical College of Philadelphia, by Dudley S. Reynolds, A. M., M. D. 

 Repriat. 



Raising Diatoms in the Laboratory, by Prof. Samuel Lockwood. Re- 

 print. 



Feeding Patients Against the Appetite, by Ephraim Cutter, M. D. 

 Reprint. 



Persistent Pain after Abdominal Section, by James B. Hunter, M. D. 

 Reprint. 



CORRESPONDENCE AND QUERIES. 



Dr. M., Pittsburgh, Pa. — Dr. Carter's injecting fluid is pre- 

 pared in the following manner : Pure carmine, 60 grs. ; liq. 

 ammonia fort., 120 grs.; glacial acetic acid, 86 minims ; solution of 

 gelatine (1 to 6 water), 2 ozs. ; water, Ij ozs. Dissolve the carmine 

 in the ammonia, filtering if necessary. With this mix thoroughly 

 an ounce and a half of the hot gelatine solution. To the remaining 

 half ounce of gelatine add the acetic acid, and drop the mixture, 

 little by little, into the solution of carmine, stirring briskly. This 

 mass answers for balsam mounts, but not when glycerine is used. 



G. R. I. — We would recommend Sternberg's work on the Bac- 

 teria as a book for general reference. For laboratory use, Crook- 

 shank's Practical Bacteriology is an excellent book. 



W. J. J., Columbus, O. — The formula for a glycerine- jelly is 

 given on p. 152 of The Microscope for this year. There are several 

 other methods of preparing the jelly, but they do not essentially 

 difPer from this one, and are no better, if as good, for a mounting 

 medium. 



F. W. D., Battle Creek, Mich. — We believe the last edition of 

 Carpenter's work on the microscope was issued in 1881. If you 

 have had no experience with the microscope we would advise you to 

 invest first in Bausch's Manipulations of the Microscope, and then 

 Manton's Beginnings with the Microscope, or James' Elementary 

 Microscopical Technology. When you have exhausted these you will 

 find Carpenter or Beal the best book for general use. The Microscope 

 will furnish you with much information which will not be found in 

 the hand-books. We also give you the latest microscopical news. 



J. D. B., Liberty, Pa. — The cover-glasses which you boiled in 

 lye are thereby rendered unfit for microscopical purposes. Alkalies 

 have the power of eating or etching glass, which acids do not seem 

 to possess. We would recommend that you use in future one of the 

 many agents, preferably that recommended by Gage, for cleaning 

 slips and covers. 



