Journal of Applied Microscopy. 



577 



with the common reading center, for note-writing with the word-writing center, 

 the song center a Httle back of Broca's motor center for speech, at the foot of 

 the third left frontal gyrus, and the center for conception of' musical ideas in the left 

 frontal lobe near the anterior association center of Flechsig. The left tone 

 center and the word center of Wernicke are distinct from each other and have 

 separate fiber tracts. 



The cause of tone deafness may lie in the ear, in its connection with the 

 brain, or in the cells of the brain, and deafness for certain tones alone may 

 exist. E. M. B. 



RECENT LITERATURE. 



Werigo, Prof. Br. Zur Frage iiber die Bezie- 

 hung zwischen Erregbarkeit und Leitungs- 

 fahigkeit des Nerven. Archiv f. Physiol. 

 76: 552-608, 7 text figs., 1899. 



Beck, A. Ueber kunstlich hervorgerufene Far- 

 benblindheit. 76: 634-640, 1899. 



Zenneck, G. Ueber die chemische Reizung 

 nervenhaltiger und nervenloser (curarisirter) 

 Skeletmuskeln. Archiv f. Physiol. 76 : 

 21-58, 21 text figs., 1899. 



Grober, Dr. Jul. A. Ueber die Athmungsinner- 

 vation der Vogel. Archiv f. Physiol. 76 : 

 427-470, 8 text figs., 1899. 



Spina, Prof. A. Ueber eine Methode, an 

 gehirn-und ruckenmarklosen Saugethieren 



zu experimentiren. Archiv f. Physiol. 76 : 



219-222, 1899. 

 Werigo, Prof. B. Ueber die Reizung des Ner- 

 ven mit dreiarmigen Elektroden. Archiv f. 



Physiol. 76: 517-530, 6 text figs., 1899. 

 Holl, M. Ueber die Insel des Carnivorgehirnes. 



Archiv f. Anat. u. Entwick. H. 3 and 4, 



217-263, Tf. XI-XIII, 1899. 

 Denker, Alfred. Zur Anatomie des Gehdrorg- 



anes der Saugethiere. Archiv f. Anat. u. 



Entwick. H. 3 and 4, 207-214, Tf. X, 1899. 

 Lubosch, Wilh. Vergleichend-anatomische 



Untersuchungen iieber den Ursprung und 



die Phylogenese des N. accessorius Willisii. 



Archiv f. Mikr. Anat. 54: 514-602, Tf. 



XXVII, i8qq. 



NOTES ON RECENT MINERALOGICAL 

 LITERATURE.. 



Alfred J. Moses and Lea McI. Luquer. 



Books and reprints for review should be sent to Alfred J. Moses, Columbia University, 



New York, N. Y. 



Baumhauer, H. Ueber sogenannte anomale 

 Aetzfiguren an monoklinen Krystallen. Zeit. 

 f. Kryst. 30: 97, 1898. 



The very important part played by the 

 so-called etch figures in determining 

 the structural symmetry of a crystal, 

 lends importance to this discussion of etch figures of unexpectedly low grade 

 of symmetry. The mineral colemannite, which is here especially studied, occurs 

 in well formed crystals of apparently definite monoclinic symmetry, and the 

 optical tests confirm this, but the etch figures developed on (010) are of three 

 distinct types, two of which are holohedral monoclinic, but the third of distinctly 

 a lower grade. Similarly in the mineral diopside there are obtained two definitely 

 monoclinic shapes, and a third anomalous shape of lower symmetry. 



The suggestion is made and discussed that in both cases the anomalous 

 figures have developed by a blending of the two different monoclinic figures, 

 and it is pointed out that in general, the anomalous figures are not sharp, but 

 somewhat curved, and frequently have prolongations which pass into the normal 



