24 E. V. COWDRY 



Van der Stricht, O. 1909 La structure de I'oeuf des Mammiferes (Chauve- 

 souris, Vesperugo noctula). Troisieme partie. Memoires Classe des 

 Sciences Acad. Royale Belgicjue, 2nd series, T. 11, pp. 1-176. 



WiLDMAN, E. E. 1913 The spermatogenesis of Ascaris megalocephala with 

 special reference to the two cytoplasmic inclusions, the refractive 

 body and the "Mitochondria:" their origin, nature and role in ferti- 

 lization. Jour. Morph., vol. 24, pp. 421-456. 



EXPLANATION OF PLATES 



All the figures were drawn by me with Zeiss apochromatic objective 1.5 mm., 

 aperture 1.30, compensating ocular 4 and camera lucida. They were reduced 

 one-fourth in reproduction so that their magnification as they now appear on 

 the plates is 960 diameters. Only spinal ganglion cells, cut about 4fj. in thickness, 

 are represented. I wish to acknowledge many helpful suggestions from \lr. 

 James F. Didusch. 



ABBREVIATIONS 



c, canalicular apparatus i., intermediate between (m) and (Z) 



I., lipoid s., sheath cells 



m., mitochondria n., Nissl substance 



PLATE 1 



EXPLANAIIOX OF FIGURES 



1 to 4 These figures are intended to illustrate the generality of the occurrence 

 of mitochondria in the spinal ganglion cells of different vertebrates. All the 

 drawings have been made from specimens prepared by Bensley's method, by 

 which the mitochondria and lipoid are colored red and the Nissl substance green. 

 Unfortunately the colors could not be represented. 



1 Homo, colored, female, 2 years (?). Anatomical diagnosis: miliary tuber- 

 culosis, tuberculous pneumonia and terminal acute bronchopneumonia; Johns 

 Hopkins Hospital autopsy no. 4095; fi.xed 4 hours after death; (this material was 

 obtained through the courtesy of Dr. Whipple of the Johns Hopkins Hospital). 



2 Macacus rhesus, female, adult; chloroformed March 11, 1914. 



3 Guinea-pig, female, 332 grams; decapitated March 24, 1914. 



4 Mus norvegicus albinus, female, length (snout to root of tail) 19 cms. ; decap- 

 itated February 27, 1914. 



