Journal of Applied Microscopy. 485 



being found with metallic sulphides in ordinary mineral veins in trachytic and 

 andesitic rocks, and not as usual in dee]>seated granitic rocks. l. McI. l. 



n- J * .c • 1 r> J r • c-1- Undoubted microscopic diamonds ob- 



Uiamond, Artificial Production of, in Silicates ^ 



correspondiug to the Actual Mode of Occur- tained, under normal pressure, by fusing 

 GeoT Mag fX^ '^^"'^' ^' ^"''^'^"'^"'- with a blow-pipe a small piece of olivine 



and stirring with a little rod of graphite. 

 Author infers that the South African diamonds may have been formed in a 

 similar way, by the action of a molten silicate (as olivine) on graphite. In 

 that locality carbonaceous shales are interrupted by the diamond-bearing rock. 

 Not probable that the diamonds were formed in molten iron at great depths 

 under great pressure (conditions used by M. Moissan in making artificial 

 diamonds) and then floated into the molten silicate rock above. l. mcI. l. 



Notes on Anthophyllite, Enstatite and Berj'l (Emerald) from North Carolina. J. H. Pratt. Am. 

 Jour. Sci. 4,5: 429, 1898. 



Anthophyllite occurs at Bakersville, Mitchell county, in boulders of altered 

 dunite, as seamed and cracked prismatic crystals of clove-brown to flesh-red 

 color, and imbedded in penninite. Found also at Corundum Hill, but more 

 fibrous and inferior in quality. 



Efistatitc found at Corundum Hill, forming a rock of interlocking grayish 

 crystals. Bronzite occurs in outcrop of dunite at Webster, Jackson county. 



Beryl (emerald) occurs in a pegmatite vein in midst of gneiss and biotite 

 schist, on divide between Brush and Crabtree creeks, Mitchell county. 



L. McI. L. 

 Orthoclase as gangue mineral in a fissure vein. Formed by aqueous deposition, but 

 W. Lindgren. Am. Jour. Sci., 4, S: 418, not common. Usually the variety adul- 



1898. ■ T^U c 



ana. Ihe very common presence of 

 carbonic acid, in thermal waters, probably prevents the abundant formation of 

 gangue orthoclase, as the more stable compounds, muscovite, or sericite would 

 be formed. l. mci. l. 



Whewellite vom Venustiefbau bei Briix. Schuert, Richard. Tschermak's Min. u. Petr. Mitt. 

 17: 251, 1898. 



NEUROLOGICAL LITERATURE. 



Edith M. Brace. 



Literature for Review should be sent to Edith M. Brace, Biological Laboratory, 

 University of Rochester, Rochester, N. Y. 



REVIEWS. 



Monckeberg, 'Georg, and Bethe, Albrecht."7Die The nerve was studied under normal 



Degeneration der markhaltigen Nervenfa- and pathological conditions with espe- 



sern der Wirbelthiere unter hauptsachlicher • 1 r 1 a, r i • • 



Beriicksichtigung des Verhaltens der Primi- ^lal reference to the role of the primi- 



tivfibrillen. Archiv. f. Mikr. Anat., 54: 135 tive fibrils in degeneration. Dogs and 



4, p . 9, 99. frogs were used, lesion was caused by 



cutting or by pressure, and material was fixed in .25 per cent, osmic acid solu- 

 tion for twenty-four hours. 



