758 NOTES. 
a gas flame at nearly a boiling temperature. For keeping the 
cover in position while the balsam is hardening, he finds the spring 
clip troublesome and uncertain, and substitutes shot or bullets, 
of different sizes according to the pressure required, laid upon the 
cover glass. The bullets are previously flattened by a blow from 
a hammer. [The conical rifle-balls which the writer has used for 
the same purpose are exceedingly convenient. | 
PRESERVING TUMORS, ETC., DURING TRANsPoRTATION.— Dr. J. G. 
Richardson recommends the popular mounting medium, a satu- 
rated solution of acetate of potash, as a temporary preservative 
of urinary deposits or other pathological specimens that are to be 
transmitted by post. Sections of tumors or of other tissues may 
often be prepared by soaking in this solution for two days. They 
are then to be removed from the solution, without much squeezing, 
and placed in a piece of india-rubber tubing, or wra ped up in 
sheet rubber or oiled silk, with the ends firmly ‘tied, and mailed in 
an ordinary letter, the deliquescent fluid with which the tissue is 
saturated preventing alike the decomposition or desiccation of the 
object. 
AMPHIPLEURA PELLUCIDA AS A Test Opsect.— Mr. Louis H. 
Noe, of Elizabethtown, N. J., has resolved this object, both dry 
and in balsam, with sunlight, through the ammonio-sulphate cell 
condensed obliquely with a small 24 inch lens, with all of the fol- 
lowing objectives: —R. & J. Beck’s „$y ary, zh wet; Powell & 
Lealand’s 4, 15, 4 dry, Js, 4 wet; Wales’ +; wet; Gundlach’s s'y 
(No. viii) wet; Hartnack’s y (No. x), ys (No. ix) wet; Tolles’ 
qo Ary, 15, & (130°) wet; and Spencer’s } wet. 
NOTES. 
Tue Yellowstone Expedition, Gen. D. A. Stanley commanding, 
arrived at Fort A. Lincoln, D. T.. September 22d, having passed 
a little over three months in active operations in the field, and 
region previously but very imperfectly known. The expedition 
left Fort Rice, D. T., June 20th, and arrived at the Yellowstone, 
a few miles above Glendive’s Creek, July 15th. Crossing the 
Yellowstone at this point, the expedition proceeded up the valley 
of the Yellowstone as far as Pompey’s Pillar, two hundred miles 
