Literary Xoticcs. 371 



Kronthal, P. Zum Kapiti-1 : Leiu.cvt und Xcivcnzelle. An, if. Am., XXII, 

 Xo. 20-21. pp. 44S-454, Jan. 30, 1903. 

 The authitr reviews his theory of the origin ot" the perikaryon and 

 dendrites from leukocytes, with special reference to the Gou^i method, 

 the histogenesis of the nerve, and the theory of P'rai.kito. 



G. E. C. 



Zuckerkandl, E. Die Riiulenbiiiulel des Alveu> bei IJeuteltieren. An,it. 

 Auz., XXIII. Xo. 2-3, pp. 4Q-»')0, April S. 1903. 



The dorsal jiart of the commissura superior receives fibers through 

 the alveus t'rom the i>allium. It represents, theret'ore. the primitive 

 Corpus callosum. (j. e. c. 



Zugmayer, Erich. I'ehtr Sinne^oiganc an den Tentakeln des Genus Car- 



dium. Zcit. f. w. ZcoL, Bd. I. XXVI. Heft 3, pp. 47S-50S. 1904. 

 Agabow, A. Ueber die X'eiven der Sclera. Archil f. mik. Anat., Bd. LXIII, 



Heft 4. [)p. 701-709. 1904. 



Kallius, E. s>ehurgan. .Mi>k€l u. Bonnet' s Ergcbtiis^c. lid. 12, (1902) pp. 34S-441 , 

 IU03. 



Kolliker, A. I'ie F^ntwicklung und lUdeutuni; dc^ (.ila»kjrper<. Zeits. f. u<. 

 ZooL, I'.d. 7''i. II. I. pp. 1-2;. 1904. 



Police, G. ^iil -i-tenia ner\<i~o -tomatoga^trico dello Scorpione. Ardnvio 

 Z(\'/<\vci', \"n]. I, Fasc. 2. pp. 170-198. 1903. 



Meigs, E. B. 'Jn the Mecliani^ni of the Ccmtraction of Voluntary Muscle of 

 the Fnig. A>tur. /our. .]/,■,/. Set., Ajiril, 11)04. 



Attention is called to the resemblance that muscle fibers in water 

 rigor have to those in tetanii>. In both instances the fibers assume a 

 beaded apj)earance and since in water rigor the form i.s dependent up- 

 on the absorption of water, it i.* supposed that in tetanu.< a like absorp- 

 tion takes place. That contraction would result from this is demon- 

 strated by an ingenious model consisting of a clo.sed rubber tube at- 

 tached to an air-pump and encircled at short intervals by metal rings ; 

 these are attached one to another by numerous longitudinal inelastic 

 threads. When air is forced into the tube, the segments between 

 pairs of rings become spherical and the inelastic threads change their 

 form from straight to cur\ed lines, thus shortening the fiber as whole. 



Ingenious as this hypothesis is. it scarcely touches the real prob- 

 lems of muscle action. Why do muscle fibers at rest fail to take up 

 fluid which they are supposed to absorb when stimulated and how does 

 a contracted muscle ever relax ? These and like questions that must 

 arise in the mind of the reader, show at once the incompleteness of Dr. 

 Mek.s' hypothesis and place it in unfavorable light in comparisou with 

 the older theories of muscle action such as those advanced by Exgel- 

 MANN and others. g. h. p. 



