296 HEROES OF SCIENCE. 



pursuit of grouse and black cock. At every halt 

 his first anxiety was to know what the rocks of the 

 place might be, and how far he could identify their 

 geological position. In Arran he filled his note- 

 book with observations and queries about granite, 

 red sandstone, limestone, and other puzzling 

 matters, on which his previous experience in field- 

 work in the south of England and in Yorkshire 

 could throw no light, and for the elucidation of 

 which he wisely resolved to secure, at some future 

 time, the guidance and co-operation of an older 

 geologist than himself. It was in the fulfilment of 

 this resolution that Sedgwick and he first became 

 fellow-workers in the field. 



In the wildest of the western islands he and his 

 wife did excellent work in collecting fossils, and 

 thereby obtaining materials for making more 

 detailed comparison between the secondary rocks of 

 the west of Scotland and those of England than 

 had been attempted by Dr. MaccuUoch. The 

 actual fossil-hunting was mainly done by Mrs. 

 Murchison, after whom one of the shells {Aminon- 

 ites Miirchisonice) was named by Sowerby, while 

 her husband climbed the cliffs and trudged over 

 the moors and crags, to make out the order of 

 succession among the secondary strata. But the 

 tour was not merely geological ; m.any a halt and 

 detour were made to get a good view of some fine 

 scenery, or to make yet another sketch. Friends 

 and highland cousins, too, were plentifully scattered 

 along the route, so that the travellers had ample 



