. 
REMARKS. MICROSCOPY. 607 
nine feet in length, and he inches se regen ie at the largest ex- 
tremity, and entirely perfect. In additi o this, he obtained about 
two-thirds of the other tusk, the lower j jaw, patent the teeth all mia | 
in their places, the teeth of the upper jaw, and also some fragments o 
es ith ound a pair of t 
i 
antlers of a large elk, with + _— other bones of the same animal, and also 
bones of the buffalo and dee These were all embedded in a quicksand 
contains Physa, Pi corbie, and Cyclas, of existing species, and beneath 
four of blac ck peaty soil. 
ea are, in the Illinois State Collection, some other remains of this 
kind, which have been found in older deposits, among which are frag- 
ments o 
recent period. At Alton, Illinois, a jaw of a mastodon, with both teeth 
remaining in place, was found at the base of the Loess, thirty feet below 
the surface 
Tue meetings of Section B were well attended, and the members while 
feeling the necessity for fuller discussions of many a, forebore to do 
so on ‘account of the limited time for critical work of the section 
e officers of the inet were Prof. C. G. SWALLO hig St. eg 
Permanent Chairman ; . J. E. Emerton of ali pallid Profe 
sors COPE, MORSE and he aia Sectional Committee. e. 
SUBSECTION (OF SECTION A.) MICROSCOPY. 
Tar Subsection of Microscopy renewed its he ag ade by the elec- 
tion of the following officers: Chairman, Prof J. E. HitGarp of Wash- 
ngton; Seeretary, Dr. me W. BUTTERFIELD of indianapolis; Sectional 
Committee, Messrs. Wa BICKNELL an UTTLE 
The attendance was smaller bee as the two previous meetings, but the 
papers and cue pre ed some points of pranda piian st. The 
rhea of Prof. Ward’s S paper is th he only one we have received in time 
Apre ne in this n 
Am he novelties of eed tus may be noticed the ohserraton of 
the p ARAW Mink on spark by the micro- -spéctroscope, by Prof. Vander 
WwW e ob 
yde; ique illumination of transparent objects aiie high pow- 
; by me: f. lis ected from a plane mirror lying up e 
and directly the mounted object—a little expedient of great prac- 
1 convenience, al rof. Vander Weyde; the ado of the Wen- 
Hc i lar arrangement ntmayer; an he somewhat genera 
into use e-piece conde ith a wide horizontal 
roduction t nsers w r 
emrini (for binoculars) upon the plan proposed by Prof. Ward yi the 
Troy meeting last summer, and Sabiished in the NATURALIST of Dec., 1870. 
Mr. Bicknell places the Sto blate between the lenses of the condenser, 
s below Prof. Ward, while 
e SO a BE. pa uniform stone tae A in the powers of objectives and 
eye-pieces being unprepared to report, Messrs. ard and Bicknell re- 
he d 
of their lenses so as to represent, as nearly as practicable, their amplify- 
ing power when in actual use; and probably the rar Sorte makers in this 
