CHAP 111 AGO KXT FOR Till-: MELD 



tell on the pomt of hit spear, he inferred that the 

 limestone existed below, and noted the (act on his 

 map accordingly. 



When the Geological Surrey was busy with the great 

 Wcaldcn area of the south-east of England, my col- 

 leagues used what they nicknamed a geological cheese- 

 taster." It was indeed a kind of large cheese - taster, 

 fixed to the end of a long stick. This implement was 

 thrust down, and portions of the subsoil and of the days 

 or sands beneath were pulled up and examined. Similar 

 devices must obviously suggest themselves according to 

 the nature of the work in different districts and countries. 



In the course of his observations in the field the 

 geologist will meet with rocks, as to the true nature of 

 i he may not be able to satisfy himself at the time. 

 He should in such cases detach a fresh chip from some 

 less weathered pan of the mass and examine it further 

 at home. Detailed methods of investigation, which may 

 be pursued with all the conveniences of a laboratory in 

 town, are not possible to him in the country. But he 

 may subject his specimens to analysis in two ways, and 

 obtain valuable, and perhaps sufficient, information as to 

 their characters. He can easily fit up for himself a 

 small and portable blowpipe box, apparatus for preparing 

 rocks, minerals, and fossils for examination, and a micro- 

 scope with which to examine them. In Part II. of this 

 nc I shall enter into some details regarding 

 these indoor employments of the field-geologist, and show 

 how the apparatus may be put to practical use. 



7. The fl/ttvpif* A.r should contain as much of the 

 most useful apparatus as space will nsisu-ntlv 



