FREE BOOKS

Author's List




PREV.   NEXT  
|<   135   136   137   138   139   140   141   142   143   144   145   146   147   148   149   150   151   152   153   154   155   156   157   158   159  
160   161   162   163   164   165   166   167   168   169   170   171   172   173   174   175   176   177   178   179   180   181   182   183   184   >>   >|  
quantity as to exhibit no metallic lustre, the neck of the bulb may be cut off with a file immediately above the sublimate, and the latter exposed to the flame of the blowpipe, when the arsenic is volatilized, and may be recognized by its garlic odor. [4] Quoted by Scheerer. If the presence of cadmium is suspected in zinc-blende, it may be detected by fusing a small piece of the blende upon charcoal in carbonate of soda. The peculiar bright yellow sublimate of the oxide of cadmium, if it be present, will not fail to indicate it. This incrustation can be easily distinguished from that of zinc. Thus, with the three illustrations we have given, the student will readily comprehend the great utility of the blowpipe in the examination of minerals. Although the following tables were not arranged especially for the last part of this work, still this arrangement is so good that by their consultation the student will readily comprehend at a glance what requires some detail to explain, and we feel no hesitation in saying that, although they are not very copious, they will not fail to impart a vast amount of information, if consulted with any degree of carefulness. The minerals given are such as are best known to English and American mineralogists under the names specified. For more detailed reactions than could be crowded into a table, the student will have to consult the particular substance as treated in Part Third. If this part is perused carefully previous to consulting the tables, these will be found eminently serviceable as a refresher of the memory, and may thus save much time and trouble. And, finally, we would certainly recommend the student, after he shall have gone through our little volume (if he is ambitious of making himself a thorough blowpipe analyst), to then take up the larger works of Berzelius and Plattner, for our treatise pretends to nothing more than a humble introduction to these more copious and scientific works. * * * * * Mineral. Diamond Formula. C Behavior in glass-bulb. -- on platinum foil. In fine powder is slowly consumed without residue in a strong oxidizing Flame. * * * * * Mineral. Graphite Formula. C with some iron silica, etc. Behavior in glass-bulb. Generally gives off water.
PREV.   NEXT  
|<   135   136   137   138   139   140   141   142   143   144   145   146   147   148   149   150   151   152   153   154   155   156   157   158   159  
160   161   162   163   164   165   166   167   168   169   170   171   172   173   174   175   176   177   178   179   180   181   182   183   184   >>   >|  



Top keywords:
student
 

blowpipe

 

Mineral

 
blende
 
readily
 
comprehend
 

minerals

 

tables

 

Formula

 

copious


cadmium
 
sublimate
 

Behavior

 

crowded

 

consult

 

finally

 

detailed

 

recommend

 

reactions

 

eminently


serviceable
 

perused

 

carefully

 
previous
 

consulting

 
refresher
 
substance
 

treated

 

memory

 

trouble


powder

 

slowly

 
consumed
 
Diamond
 

platinum

 
residue
 

strong

 

Generally

 

silica

 

oxidizing


Graphite

 

scientific

 
introduction
 

ambitious

 
making
 
volume
 

analyst

 

treatise

 
pretends
 

humble