LITHOLOGY. 117 



The microscope, with the apparatus required in its 

 use, is well described in Chap. i. of " Half-hours with 

 the Microscope," by E. Lankester, M.D. ; the use of the 

 polariscope in Chap. vii. ; and the " preparation and 

 mounting of objects" in an Appendix to the same work. 



Chemical Analysis. Few remarks only will be made 

 on this subject, for (as Mr. Jukes has said*) " proper 

 detailed chemical analysis is not possible, as a rule, to a 

 geologist at work in the field, but he should apply for 

 this assistance not unfrequently." It is the only way 

 of ascertaining the ultimate composition of a rock, but 

 the process is generally a tedious one and requires much 

 experience. 



There are some rocks and ores of the metals which 

 may be analysed without much trouble ; the method of 

 procedure is plainly given in the little work by Pro- 

 fessor Johnston mentioned in the following list, and 

 the subject is more fully treated in Bischoff's " Chemical 

 Geology." 



LIST OF BOOKS OF EEFEEENCE. 



MINERALOGY. Glossary of Mineralogy. Bristow. (Longmans.} 

 Mineralogy. Kutley. } (Murby's 



Mineralogical Tables. Jewsberry. ) series.) 

 Manual of Geology. Jukes and Geikie. (Slack.) 

 Geology and Mineralogy. Trimmer. (Parker.) 

 Ansted's Geology. (Van Voorst.) 

 Dana's System of Mineralogy. (Tritbnerand Co.) 

 Determinative Mineralogy. Brush. (Triibner 



and Co.) 

 BLOW- PIPE. Scheerer and Blandford on the Blowpipe. 



Determination of Minerals by the Blowpipe. 

 Fuchs. Translated by Danby. (Field and Tuer.) 



* Op. cit. p. 96. 



