194. GEOGNOSY. | 2° Beoreit am 
with blow-pipe analysis the student must refer to one or other of 
the numerous text-books on the subject, some of which are mentioned 
below! For early practice the following apparatus will be found 
sufficient :— 
1. Blow-pipe. 
2. Thick-wicked candle, or a tin box filled with the material of Child’s 
night-lights, and furnished with a piece of Freyberg wick in a metallic 
_ support. 
3. Platinum-tipped forceps. 
4, A few pieces of platinum wire in lengths of three or four inches. 
5. A few pieces of platinum foil. 
6. Some pieces of charcoal." 
7. A number of closed and open tubes of hard glass. 
8. Three small stoppered bottles containing sodium carbonate, borax, 
and microcosmic salt. 
9. Magnet. 
This list can be increased as experience is gained. The whole 
apparatus may easily be packed into a box which will go into the 
corner of a portmanteau. 
1 The great work on the blow-pipe is Plattner’s, of which an English translation has 
been published. Elderhorst’s Manual of Qualitative Blow-pipe Analysis and Determi- 
native Mineralogy, by H. B. Nason and C. F. Chandler (Philadelphia: N. 8. Porter and 
Coates), is a smaller but useful volume ; while still less pretending is Scheerer’s Intro- 
duction to the Use of the Mouth Blow-pipe, of which a third edition by H. F. Blanford 
was published in 1875 by F. Norgate. An admirable work of reference will be found 
in Professor Brush’s Manual of Determinative Mineralogy (New York: J. Wiley and 
Son). 
The student who would pursue physical geology by original research in the field and 
abroad may consult Boué, “ Guide du Géologue Voyageur,” 2 vols. 1835; Elie de Beau- 
mont, ‘ Lecgons de Géologie pratique,” vol. I., 1845; Penning and Jukes-Browne, “ Field 
Geology,” 2nd edit. 1880; A. Geikie, ‘‘ Outlines of Field Geology,” 1879. 

