Scientific Iutelliyence. 153 



by Dr. Hildreth demonstrate, that it may be found also below coal ; 

 and, that what our geologists would term new red sand-stone is in 

 reality associated with .coal. When the sand-stone assumes a red 

 colour, it would appear" to prove that the agency of heat has been 

 exerted in its neighbourhood, for, when we ignite various varieties 

 of white sand-stone, they assume a red aspect. The saline fountains 

 in Ohio are characterized by their evolving quantities of carburetted 

 hydrogen, which brings up with it large quantities of petroleum. 



We must now conclude this notice, but cannot do so without ex- 

 pressing the high degree of satisfaction we have received from the 

 perusal of the geological memoir of Dr. Hildreth. If his knowledge 

 of fossils had been equal to his powers of observation, the paper 

 would have been still more valuable. We can learn from his ob- 

 servations, however, that he does not confine his researches to the 

 mere external description of masses of stones ; but that he brings in 

 to his assistance, the collateral sciences, without whose aid, geological 

 details, as they are given too often in our own country, are mere 

 lumber. The illustrating lithographs and wood cuts appended to the 

 memoir are excellent specimens of the American arts. 



III. The Doctrine, of proportion, or Geometrical Admeasure- 

 ment by similar triangles, practically applied to expanding or 

 diminishing Drawings. London, 1836. Ackermann and Co. 



The object of this publication is to fix the principles of drawing 

 upon mathematical, and, therefore, upon fixed and invariable prin- 

 ciples. It is just such a work as we have long wished to see; and 

 Ave have no doubt, that it will be properly appreciated, by those 

 for whom it is intended, viz., all who wish to draw correctly and 

 scientifically. 



Article XI. 



SCIENTIFIC INTELLIGENCE. 

 I. — Pharmaceutical Preparations. 



1. Indigo in -Epilepsy. — Dr. Ideler, of Berlin, has treated 20 

 cases of epilepsy with indigo ; of these, were cured without a re- 

 lapse, 3 had relapses after some months, 11 were much relieved, and 

 upon (i no effect was produced. His formula is, R Pule. Indig. oz. \, 

 J'u/r. Aromat. dr. .!, Syrup. Simp, q, s. ut ft. electuar. To be 

 taken at first in two days, and then in a single one. The dose of 

 indigo may be increased to (i or 8 drachms per day. The first effects 

 arc nausea and vomiting. It also induces constipation ; the urine is 

 brown. — Rust's Magazine. 



•2. Antiseptic Liquid. — M. Lereboullet, Conservator of the Mu- 

 seum of Natural History at Strasbourg states, that for two years 

 the anatomical preparations in this establishment have been preserved 

 by a liipiid consisting of chloride of calcium I parts, potash-sulphate 



