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 DiflFerentation from Body Cells 309-310 



M1SCELI.ANE0US 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 



