THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL. 



Entered at the post-office as second-class matter. 



VOL, XX, OCTOBER, 1899, NO, 10, 



CONTENTS. 



The Existence of Bacillaria in the Basalt of New Jersey. Dr. 



Edwards. With Frontispiece 291-294 



Meeting of the American Microscopical Society at Columbus.... 294-296 



Achromatics versus Apochromatics. Spitta 296-309 



Amoeba and their Differentation from Body Cells. ; 309-310 



Miscellaneous Notes. — Cooke. — To Neutralize Balsam ; 

 Covers ; Bone Sections ; Rock Sections ; Luminousness; 

 Drying Oils ; Killing Objects ; Dimensions ; To Fix Objects ; 

 Ink ; Stain ; Colored Leaves ; Chromic Acid ; To Fix Tissues; 

 Wickersheim's Fluid ; Preservative ; Pond Animals; Object- 

 ives ; Picro-carmine 311-317 



Microscopical Manipulation.— Removing Air-bubbles from 



Mounts ; Double-staining 317-318 



Biological Notes. — Parasites of the House Fly 318-319 



NEW Publications. — Catalouges of Browning, Zeiss and 



Hicks ; the Slime Moulds of N. A 319-320 



Microscopical Notes.— Slides 320 



The Existence of Bacillaria in the Basalt of New Jersey. 



ARTHUR M. EDWARDS, M. D., F. L> S. 



With Frontispiece. 



I write to emphasize the finding of shells or lorica of 

 Bacillaria in the trap rock of New Jersey, the grey al- 

 most black, solid, hard rock of the Orange mountains, 

 since they have not heretofore been recognized in trap 

 rock anywhere. Incidentally thereto I will refer to the 

 origin of the trap rocks for I think that they have been 

 incorrectly referred to an earlier age, — the Newark. It 



