170 



Scientific In t ell i gen ce. 



more than a liter, it is obvious that a very compact generator 

 may be capable of delivering a considerable supply 01 the gas, 

 and we have found the diminutive apparatus shown in the 

 accompanying figure an exceedingly con- 

 venient addition to the furnishings of the 

 laboratory table when chlorine is needed fre- 

 quently and in small amounts. This little 

 generator is easily made of a side-neck test 

 tube, funnel tube, stopper, glass stopcock, and 

 flask. The upper chamber of the test tube, 

 which is constricted near the middle, holds 

 easily ten grams of the fused chlorate, and 

 when the outer flask is filled with hot water 

 the automatic action is satisfactory for a con- 

 siderable length of time. A little wash-bottle 

 containing a hot saturated solution of manga- 

 nous chloride in strong hydrochloric acid is a 

 desirable addition when a purer gas is needed 

 than that delivered directly from the generator, and the attach- 

 ment of the ignition tube makes it possible to secure the 

 chlorine entirely free from chlorine oxide, though carrying, of 

 course, some free oxygen. 



SCIENTIFIC INTELLIGENCE 



I. Geology and Minekalogy. 



1. Geologic Atlas of the United States, Livingston Folio, 

 Montana (folio No. 1), U. S. Geol. Sitrv., J. W. Powell, Direc- 

 tor. Washington, 1894, Ex. 2° 2 pp. text, 4 maps 1 pi. — Those who 

 are interested in the progress of the work performed by the Geo- 

 logical Survey will be pleased to see this folio. Some small pre- 

 liminary and experimental editions of similar sheets have been 

 previously published, but this is the first folio issued in complete 

 form and for the public. It marks in a certain way the 

 beginning of the final results for which the Survey was organized. 

 There are few, save those who have watched the progress of the 

 organization from its inception, who realize the vast amount of 

 careful and laborious work necessary to produce the present folio. 



The area chosen for illustration upon the first sheet of the 

 geologic and topographic atlas, has been well selected to 

 display the high order of scientific work the survey is doing. 



It lies between 110° and 111° west and 45° and 46° north ; and 

 Livingston, situated on the Northern Pacific R. R. and the Yellow- 

 stone River, and within these boundaries, has given its name to 



