CYTOPLA.SMIC CONSTITUENTS OF NERVE CELLS 419 



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1910 a tJber Structuren in den Zellen des embryonalen Stiitgewebes 

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1911 Uber die Beteiligung der Plastochondrien an der Befruchtung 

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EXPLANATION OF PLATES 



All the illustrations have been drawn by Mr. A. B. Streedain, artist to the De- 

 partment of Anatomy of the University of Chicago, to whom I wish to acknowledge 

 my thanks. Preparations of nerve cells of developing chick embryos alone have 

 been used. Camera lucida, Zeiss apochromatic objective 1.5 mm. and compen- 

 sating ocular 6 were employed for all except figures 21 and 23-27, of which figures 

 21 and 25-27 were drawn with objective 1.5 mm. and ocular 8, figure 23 with ob- 

 jective 2 mm. and ocular 4 and figure 24 with objective 2 mm. and ocular 6. Thej' 

 have not been reduced in reproduction so that their magnification as they now 

 appear on the plates is as follows: for figures 21 and 25-27, 2200 diameters; for 

 figure 23, 820 diameters and 1050 diameters for figure 24, for all the others 1500 di- 

 ameters. All sections were cut 4)u in thickness. Onlj- specimens from transverse 

 sections have been figured. The colors have invariably been put in by daylight 

 so that the uncertainty and variabilitj' involved in artificial illumination has been 

 avoided. 



