228 Reports and Proceedings. 



early journeys made by her husband and herself in this country, 

 France, Germany, Switzerland, and Italy, he dwelt upon the great 

 influence which she had exercised upon Sir Eoderick Murchison in 

 leading him into the paths of science, and encouraging him by her 

 assistance. It was she who induced him to forsake the ordinary 

 amusements of a retired cavalry officer, and devote himself to that 

 branch of science in which he has so distinguished himself. For 

 many years, and while her strength enabled her, she was his fre- 

 quent companion by seashore, mountain, and glen, aiding him in his 

 observations, and making for him those remarkable geological sketches 

 of landscape for which the " Silurian System" and " Siluria" are so 

 well known to Scottish geologists. It was of interest to remember 

 that many of the fossils from which the true age of the Secondary 

 rocks of Sutherland and the Western Isles was made out were col- 

 lected by her. Throughout her long life she maintained a warm 

 interest in all that related to the progress of science, and in all that 

 might promote the happiness of those by whom science is cultivated. 

 To Sir Eoderick Murchison himself this Society, like all other geo- 

 logists in this country, owed a debt of gratitude for the unequalled 

 contributions which he had made to Scottish geology ; but they were 

 likewise indebted to him for acts of kindness which he had shown 

 to the Society. It seemed but fitting, therefore, that the recent 

 melancholy event should not pass away without some expression of 

 sympathy with him, and of regret at the loss of one who, both by 

 her own exertions and through the labours of her husband, has been 

 so intimately associated with the history of geology in Scotland. 



The following papers were then read : — -1. " On the Silurian Beds 

 of the Pentland Hills." Part 2. By John Henderson and D. J. 

 Brown. 



The first part of this elaborate paper was read before the Society 

 in Session 1866-67, and appears in the Transactions for that year. 

 The authors gave a brief resume of the first portion of their joint 

 paper. They stated that both the Wenlock and Ludlow formations 

 were represented in the district of the Pentland Hills near the North 

 Esk Eeservoir. They described the beds as they occur in succession 

 in the North Esk, noticing, in passing, their characteristic fossils. 

 They showed that the uppermost vertical beds in this section, sup- 

 posed to be of " Lower Old Eed Sandstone" age by the Geological 

 Survey, and to be of a very local nature, extended from the North 

 Esk to the Lynn Water, a distance of two miles in the direct line of 

 strike ; and that the beds in the Lynn Water, termed Greywacke by 

 Maclaren, and coloured Silurian on the Geological Survey's Map, do 

 in reality overlie these supposed Lower Old Eed Sandstoue beds of 

 the Geological Survey. They then proceeded to describe the upper- 

 most beds in the Lynn Water, the lower of which, from their fossil 

 contents, they identified as a continuation of the upf)ermost fossili- 

 ferous beds in the North Esk section. Above these fossiliferous beds 

 in the Lynn Water, they were able to trace the Old Eed Sandstone 

 throughout its whole extent, overlain by vertical shales of appar- 

 ently the same nature as those of the North Esk described by Mac- 



