FREE BOOKS

Author's List




PREV.   NEXT  
|<   77   78   79   80   81   82   83   84   85   86   87   88   89   90   >>  
n fact, induce this importation, and to this day the bulk of chemists and perfumers continue to use these foreign oils, notwithstanding the fall in the price of the English oil. The constant demand, however, in America (where people will have things good) will yet support the price of the genuine article--that is, of the English oil, which is the finest the world produces. Attempts were made by a French manufacturing perfumer to establish a plantation in the south of France of plants taken from parent stems grown in England. The result was that the young plants deteriorated to their original condition--even there in their native habitat. The character of a plant and the character of its produce depend even on more than a similarity of soil and geographical position. It is asserted that a good judge can distinguish between the oils produced by two adjacent fields, and the difference in odor is very apparent between the oils produced in Hertfordshire and in Surrey. The oil produced in Sussex is different from both.--_Chemist and Druggist_. * * * * * SPECTRUM OF THE SUN AND ELEMENTS. The _Johns Hopkins University Circular_, No. 85, issued in February, contains Prof. Rowland's report of progress in spectrum work. The spectra of all known elements, with the exception of a few gaseous ones, or those too rare to be yet obtained, have been photographed in connection with the solar spectrum, from the extreme ultra-violet down to the D line, and eye observations have been made on many to the limit of the solar spectrum. A table of standard wave lengths of the impurities in the carbon poles extending to wave length 2,000 has been constructed to measure wave lengths beyond the limits of the solar spectrum. In addition to this, maps of the spectra of some of the elements have been drawn up on a large scale, ready for publication, and the greater part of the lines in the map of the solar spectrum have been identified. The following rough table of the solar elements has been constructed entirely according to Prof. Rowland's own observations, although, of course, most of them have been given by others: _Elements in the Sun, arranged according to Intensity and the Number of Lines in the Solar Spectrum_. According to intensity. According to number. Calcium Zirconium Iron (2,000 or more) Magnesium (20 or more) Iron Molybdenum Nickel
PREV.   NEXT  
|<   77   78   79   80   81   82   83   84   85   86   87   88   89   90   >>  



Top keywords:

spectrum

 
elements
 

produced

 

lengths

 

observations

 

plants

 
spectra
 
character
 

According

 
Rowland

constructed

 

English

 

standard

 

carbon

 

impurities

 

obtained

 

gaseous

 

exception

 
progress
 

violet


extreme

 

photographed

 

connection

 

Elements

 
arranged
 

Intensity

 
Number
 

Magnesium

 

Molybdenum

 
Nickel

Zirconium

 

Calcium

 

Spectrum

 

intensity

 

number

 

report

 
addition
 

length

 

measure

 

limits


identified

 

publication

 

greater

 

extending

 
French
 
manufacturing
 

perfumer

 

establish

 
Attempts
 

finest