1887) T P 297 
e prairie was unbroken where these hills were seen, though 
cultivated fields were not far distant. Query, Where did the 
ants get their sunflower see 
There were three other gentlemen with me who observed and 
commented on this curious circumstance.—Erving L. Richardson. 
MICROSCOPY. 
The Embryoscope.—The embryoscope devised by Hartnack? 
represents an improved form of the drawing apparatus introduced 
y Professor His3 The magnifying power of this instrument 
may be made to vary at pleasure from four to seventy diameters, 
thus offering the same facilities for making exact contour draw- 
ings with low powers that the microscope affords with higher 
powers. 
For this wide range of magnification only two objectives are 
used. The height of the rod bearing the mirror, the object-table, 
the objective, and the camera lucida, is about 40 cm. The glass 
ted by C. O. WHITMAN, Ph.D., Mi veers Wisconsin, 
2 Edi 
Zeitschrift für Instrumentenkunde, Sept. 1 1881, p. 284. 
menschlicher Embryonen, Leipzig, "1880, AS 
