282 



THE POPULAR SCIENCE MONTHLY. 



It is well adapted to the assay of alloys, but 

 when ores are to be assayed very great care 

 is required to obtain a fair sample in so 

 small a quantity of material. With these 

 drawbacks, blow-pipe analysis offers many 

 advantages over wet analysis, as it requires 

 no special laboratory, and the apparatus are 

 much more portable. 



Chapter VIII contains a description of 

 the important ores and coal, and the last 

 chapter is devoted to determinative miner- 

 alogy. In this chapter, the minerals, like 

 plants in a botanical key, are subjected to 

 an artificial classification depending on cer- 

 tain external properties. The classes are 

 then subdivided according to their reaction 

 before the blow-pipe, such as fusibility, odor, 

 or coat on charcoal. The method of writing 

 the mineral formulas is that followed by 

 Plattner and Kobell. 



Professor Cornwall's book is, on the 

 whole, so complete and practical, that it 

 will soon take the place of the larger and 

 more expensive manual of Plattner in our 

 leading scientific schools. 



Catalogue of 1,098 Standard Clock and 

 Zodiacal Stars. Prepared under the 

 direction of Simon Newcomb. Pp. 314. 



This catalogue was commenced at the 

 Naval Observatory for the purpose of ob- 

 taining standard positions of reference stars 

 for use in the lunar and planetary theories, 

 especially in the reduction of the older 

 occultations. In 1877 the unfinished work 

 was turned over to the office of the Ameri- 

 can Ephemeris, and has been completed by 

 Chauncey Thomas, U. S. N., under the per- 

 sonal direction of Professor Newcomb. 



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Potable Water and the Relative EfiBciency of 

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Is Tubercular Consumption a Contagious and 

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On Nocturnal Epilepsy, and its Relations to 

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Forestry Bulletins of the Census Office, 18 to 

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Some Points on the Administration of Anaes- 

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Report of the Bureau of Statistics relative to 

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