50 



K. MITSXJKUrJ : STfDIES OX 



mittloren Stabe durclisetzt." A careful study of tlioso ellipsoids 

 obliges mo to differ from Selenka. in the details. A detailed 

 stud}' under a higher power shows that they are not as regular 

 as represented in Selenka's figs. 15 and l'/. If, with a dull 

 point of needle, pressure is brought to bear on tlie cover-glass 

 not long after a preparation of the ellipsoids is made in canada- 

 balsam, tlie ellipsoids begin to roll al)out on their axes, and 

 one is then able to get a glimpse of all their sides. Textfig. 



Textfig. lO. 



MuUerln mamUtla: n— Common and regular type of ellipsoiila ; ?;- Irregular type; c— Siile 

 Tiew o£ an ellipsoid ; d — Side view o£ another ellipsoid with a double row of holes in the 

 middle part; e— (/ — Simple types; h 1— 5— DifTerent views of an ellipsoid seen while rotating 

 aboiit its longitudinal axis; fc — Transverse section of an ellipsoid: 1 — central rod, 2— paired 

 rods at each edge, 3 — rods running in the middle of the two broad surfaces ; l—n — Tables. 

 («—/<■, ca. X 300 ; l—n, x 200). 



h 1 — Ti show sketches of an ellipsoid in various aspects, made 

 as it rolled about. In fig. // 1 we observe one side. The arches 

 on that side (as delineated by heavy lines) arc irregular. As it 

 rolls from left to right, it begins to show its left edge (fig. h 2), 



