September 27, 1901.] 



SCIENCE. 



491 



Chas. Baskerville, Lionel Weil and I. 

 F. Harris. 



The work of Ditte on HgSO„HClwas re- 

 peated and found correct. HgS0^,2HCl 

 was also prepared. Hydrated cadmium sul- 

 phate (SCdSO^jSH^O) was treated with an- 

 hydrous hydrochloric acid under different 

 conditions of temperature, time and varia- 

 tion of masses and the water replaced 

 gradually by hydrochloric acid. Eventually, 

 under certain conditions, the sulphuric acid 

 was entirely replaced by hydrochloric acid. 

 E. F. Smith has made similar observations 

 with sodium and potassium sulphates, but 

 in no case was all the sulphuric acid re- 

 placed as observed with compounds treated 

 of in this paper. 



This paper will be published in the Jour- 

 nal of the American Chemical Society. 



27. ' The Origin and Use of Natural Gas 

 at Manitou, Colo. ' : William Strieby. 



The paper opens with a statement of the 

 geological features of the region about 

 Manitou in so far as they have a bearing 

 upon the origin of the carbon dioxid, viz., 

 the limestones at Manitou, the rock-fault 

 following the line of the Ute Pass, the ig- 

 neous rocks of the higher lands westward at 

 Cripple Creek, etc. Analyses of waters 

 from several springs at Manitou are given 

 and discussed with a view of tracing the 

 source of the mineral matters and gas con- 

 tained in them. Some theories of the ori- 

 gin of carbon dioxid are briefly summarized 

 and dismissed as inapplicable tothis locality. 

 A short discussion of chemical reactions 

 occurring in rocks due to permeating solu- 

 tions gives a basis for the theory adopted in 

 this paper, and finally a few confirmatory 

 facts are cited and a reference made to the 

 gas springs at Saratoga, New York, and 

 Canon City, Colorado. 



The latter part of the paper details the 

 work done under the direction of the writer 

 in the measurement of the gas given off at 

 some of the springs at Manitou, the calcu- 



lation of the quantity of carbonated water 

 to be obtained, the design of suitable ap- 

 paratus for catching the gas and the choice 

 of compression and carbonating machines 

 to produce the gassed mineral water. 



The following papers were read by title. 

 With few exceptions, they will be published 

 in the Journal of the American Chemical 

 Society. 



' Analysis of a Few Southwestern Coals ' : Her- 

 man Poole. 



'Copper — Its Scientific and Commercial Value': 

 W. S. Ebeeman. 



' The Photometric Analysis of Sulphates ' : Dan- 

 iel D. Jackson. 



' What Constitutes Instruction in Technical Chem- 

 istry ?' Edward Hart. 



' Eeview of Recent Work upon the Structure of 

 Metals and Binary Alloys ' : J. A. Mathews. 



' Methods of Standardizing Acid Solutions ' : 

 Cyril G. Hopkins. 



'The Determination of Sulphur in Iron and Steel ': 

 Wm. a. Noyes and L. Leslie Helmer. 



' Decomposition of Sodium Nitrate by Sulphuric 

 Acid— Part III ': C. W. Volney. 



* Quantitative Determination of Hydrofluoric 

 Acid ' : W. E. BURK. 



' A Theory of the Production of Arsine and Stibine 

 in the Marsh and Gutzeit Tests, and Some Causes of 

 Quantitative Variations therein ': Edwin A. Hill. 



' A Study of the Chemical Composition of Meat 

 Extracts': H. S. Grindley. 



' Chemical Changes produced by the Action of Bac- 

 teria ': H. S. Grindley. 



' Derivatives of Diphenyl Ether ' : A.N. CooK. 



'Some Experiments with the Mononitro-orthoph- 

 thalic Acids ' : Martson Taylor Bogert and Leo- 

 pold BOROSCHEK. 



' On the Determination of Formaldehyde ' : A. G. 

 Craig. 



'A Modification of the Sulphuric Acid Tests for 

 Formaldehyde in Milk ' : A. GusTAV Luebert. 



'The Synthesis of Ketodihydroquinazolins from 

 Anthranilic Acid ' : August Henry Gotthelf. 



' A Comparison of the Solubility of Acetylene and 

 Ethylene ' : SAMUEL A. TuoKER and Herbert R. 

 Moody. 



'Cryoscopio Experiments with Sulphur': Alex- 

 ander Smith. 



' The Electrolytic Determination of Molybdenum ': 

 Lily Gavit Kollock and Edgar F. Smith. 



'The Indirect Weighing of Quantitative Precipi- 

 tates ' : R. W. Thatcher. 



