752 



SCIENCE. 



[N. S. Vol. IX. No. 230. 



cohol in chloroform distills without chauge at 

 54° approximately, under a pressure of 770.2 

 mm. of mercury. 



IV. A solution containing 12-13 fo methyl 

 alcohol in acetone distills without change at 

 55.9°, under a pressure of 764.8 mm. of mer- 

 cury. The boiling point of this mixture is about 

 0.8° below that of the constituent which is pres- 

 ent in greatest amount. 



V. A solution containing 15-20 fc of carbon 

 tetra-chloride in acetone distills without change 

 at a temperature but 0.05° below that of the 

 pure acetone, and all mixtures containing more 

 than 40 /o acetone boil within one degree of the 

 boiling point. 



VI. The close proximity of the boiling points 

 of the constituents appears to be a favorable 

 condition for the existence of a maximum or 

 minimum point on the boiling-point curve. 



VII. In general one constituent remaining 

 the same, mixtures with substances of similar 

 chemical constitution yield similar boiling-point 

 curves. 



The second paper was read by Dr. F. K. Cam- 

 eron, and was entitled 'Boiling Points of Mix- 

 tures. ' 



Dr. H. C. Bolton read an interesting paper 

 on ' The Development of Pneumatic Chem- 

 istry,' which was profusely illustrated with 

 lantern slides. 



William H. Keug, 



Secretary. 



GEOLOGICAL CONFERENCE AND STUDENTS' CLUB 

 OF HARVARD UNIVERSITY. 



Students' Geological Club, April 11, 1S99.— Mr. 

 L. La. Forge reviewed Gregory's ' Plan of the 

 Earth,' indicating several questionable steps in 

 that writer's recent exposition of the subject. 

 Mr. A. W. G. Wilson described a unique lake 

 in Ontario, which is known as Lake-on-the- 

 Mountain. 



Geological Conference, April 2S, 1899. — Mr. 

 R. E. Burke communicated ' The Discovery of 

 Fossils in the Roxbury Conglomerate,' and will 

 publish on it at an early date. 



Under the title ' Mineral Veins of the Mys- 

 tic Quarries, Somerville,' Mr. R. B. Earle re- 

 ported the results of his studies in that field. 

 The veins, which are almost entirely limited to 



a dike and a sill, are composed chiefly of cal- 

 cite, but include small amounts of quartz, pyrite 

 and prehnite. The speaker divided the fissures 

 which these veins fill into five classes according 

 to their origin, which he believed to have been 

 by contraction of the molten magma, by earth- 

 quakes, by tortion, by faulting or by decompo- 

 sition. The growth and enlargement of these 

 fissures, when once formed, was held to be 

 mainly due to the expansive force of the vein- 

 filling substance. 



Mr. G. C. Curtis exhibited a topographic 

 model, which he has constructed, of an area lo- 

 cated in the eastern foothills of the Cascade 

 Range, near the great bend of the Columbia 

 River, in Kitattas County, Washington. 



J. M. BOUTWELL, 



Recording Secretary. 



DISCUSSION AND CORRESPONDENCE. 

 TELEPATHY ONCE MORE. 



To THE Editor of Science : Why Professor 

 Titchener should have taken an essay which he 

 now admits to have completely failed even to 

 make probable its point, as an example of the 

 ' brilliant work ' which ' scientific psychology ' 

 can do in the way of destroying the telepathic 

 superstition, may be left to be fathomed by read- 

 ers with more understanding of the ways of 

 ' Science ' than I possess. 



Meanwhile, as one interested in mere ac- 

 curacy, I must protest against two impressions 

 which Professor Titchener, in your number of 

 May 10th, seeks to leave upon the reader's mind. 



The first is that whispering was first consid- 

 ered by Professor Lehmauu. It has been elab- 

 orately discussed in the S. P. R. Proceedings 

 over and over again. Sidgwick's 6-page discus- 

 sion of it in the report of his own experiments 

 is the basis of comparison used by Lehmaun in 

 his ampler but abortive investigation. 



The second of Professor Titehener's implica- 

 tions is that it was Lehmann who introduced 

 number-habits, and even forced the admission 

 of them on the recalcitrant Sidgwick. Lehmaun 

 makes no mention of number-habits. Sidgwick 

 himself introduces them to account, not for the 

 thought transference results, but for the many 

 errors common to the guesses of his Subjects and 



