M 'CLUNG : SPERMATOCYTE DIVISIONS OF THE LOCUSTID.K. 231 



28. Sutton, W. S., 1900. The Spermatogonial Divisions of 

 Brachystola magna, Kans. Univ. Quart., vol. 9, No. 2. 



29. Toyama, K., 1894. On the Spermatogenesis of the Silk- 

 worm, Bull. Coll. Agric. Imp. Univ. Japan, vol. 2. 



30. V. la A r alette St. George, 1897. Zur Samen-und Eibil- 

 dung beim Seidenspinner (Bombyx mori) , Arch. mikr. Anat., 

 vol. 50. 



31. Wagner, J., 1896. Beitrage zur Kenntniss der Sperma- 

 togenese bei den Spinnen, Arb. Nat. Ges. St. Petersburg, vol. 26. 



32. Wilcox, E. V., 1895. Spermatogenesis of Caloptenus 

 femur-rubrum and Cicada tibicen, Bull. Mus. Comp. Zool. Har- 

 vard Univ., vol. 27. 



33. Wilcox, E. V., 1896. Further Studies on the Sperma- 

 togenesis of Caloptenus femur-rubrum, ibid., vol. 29. 



34. Wilcox, E. V., 1897. Chromatic Tetrads, Anat. Anz., 

 vol. 14. 



35. Wilcox, E. V., 1901. Longitudinal and Transverse Di- 

 visions of Chromosomes, Anat. Anz., Bd. 19, No. 13. 



36. Wilson, E. B., 1900. The Cell in Development and In- 

 heritance. New York ; 2d ed. 



37. de Sinety, R., 1901. Recherches sur la Biologie et 

 l'Anatomie des Phasmes, La Cellule, Tome 19, ler fascicule. 



DESCRIPTION OF FIGURES. 



Drawings were made with a camera lucida, the optical com- 

 bination being a 1-16 B. & L. objective and a Watson " Holo- 

 scopic" ocular No. 7. Details were studied with a Zeiss 2-mm. 

 apochromat, N. A. 1.30. As reduced in reproduction, an en- 

 largement of 1500 diameters exists. Photomicrographs, except- 

 ing those of figures 37 and 38, were made by the use of the arc 

 light and horizontal camera. The exceptions represent illumi- 

 nation by ordinary diffuse daylight. In all cases the lenses 

 used were the Zeiss 2 mm., N. A. 1.30 objective and projection 

 oculars. A Watson " Parachromatic" oil-immersion condenser 

 of 1.30 N. A. was employed to illuminate the objects. In use 

 it was stopped down to between .75 N. A. and 1.0 N. A. 



