EIGHTEENTH ANNUAL MEETING. 21 



perforated tube, filters through the substance to be extracted, and passes back into 

 the flask. After the operation has continued as long as is desired, the perforated 

 tube is removed, the apparatus inclined so as to carry the condensed liquid out in- 

 stead of back, and the solvent distilled off. The solvent may thus be recovered, which 

 is an item of no small importance where ether is used and many determinations are 

 to be made. The flask with the substance extracted is then carefully dried and 

 weighed. 



The chief advantages of this extractor are, its simplicity and consequent con- 

 venience of handling, and its freedom from corks which come in contact with the 

 solvent. It avoids the slender tubes and multiplicity of connections so common 

 in extractors, and at the same time can be manufactured at a very moderate cost* 

 Every chemist knows the difficulty and inconvenience of completely removing the 

 soluble substances from corks, but if it is desired the flask can be made without 

 having the neck ground, and it can be connected by a cork to an inverted Liebig's 

 condenser. In this form the extractor is still cheaper, and, even with the one cork, 

 is more desirable than any other form that has come under our notice. 



This apparatus was designed for quantitative work, but with some modifications 

 it might be adapted to pharmaceutical operations. The flask would have to be made 

 deeper and the neck much wider, to admit a large perforated tube. The flask could 

 be connected with the condenser by means of a broad ring of glass, ground on its 

 outer edge to fit the neck of the flask, and within to fit the condenser tube. In that 

 way an apparatus of considerable capacity could be constructed, and we think at 

 less cost than those now in use. 



EEPOKT ON GEOLOGY. 



BY ROBERT HAY, 

 One of the members of the Geological Commission of the Academy. 



The writer does not know of any geological work accomplished in the State dur- 

 ing the past year, which is available for this report to the Academy, except that 

 done by himself, most of which will be given in papers on definite subjects. There 

 is one point, however, to which he must definitely refer here, viz., the easterly ex- 

 tension of the Tertiary formations in southern Kansas. In the northern part of the 

 State the eastern limit has been marked by Prof. Mudge and Prof. St. John, with 

 some approach to accuracy, notwithstanding the difficulty of distinguishing them 

 in that region from the yellow marl or other quarternary deposit. In the southern 

 part, however, no map of the State has yet recognized the existence of Tertiary de- 

 posits south of the Arkansas river, or as immediately resting on paleozoic forma- 

 tions. The writer has found this year, however, that the formation which in his 

 report on Norton county he called the Equiis Beds (Cope), is the deposit forming 

 the high prairie in the counties of Hamilton, Finney, Seward, Ford, Edwards, Pratt, 

 Comanche, Barber, Kingman, and Sedgwick. In the latter county he found it east 

 of the sixth principal meridian, east of the Arkansas river, a few miles out of Wichita, 

 and there it was in contact with the Permian strata of the region. 



In many places this formation, which in our note-books we uniformly designate 

 as tertiary marl, lies over the same deposit which in the northwest we have called the 

 Loup Fork. It contains the same fossils, mammalian bones, and turtle; and has the 

 same variety of structure, from a mortar-like grit to a heavy conglomerate. In sev- 

 eral places, however, it was manifest that the mortar-like grit is the upper part of 

 the deposit, the conglomerate being below. We found the conglomerate beneath the 



