ARCTIC PLANT-BEDS IN SCOTLAND 55 



that of DapJmia pulex. But it is in the abundance of Apns 

 remains that this old Fifeshire lake surpasses all the other old 

 Arctic lakes yet known, they being literally in thousands 

 portions of the carapace, the labrum being often quite perfect, 

 mandibles and maxillae, right and left body segments and 

 telsons, swimming-feet, and bits of the appendages. 



Dronachy Loch has been adopted as a distinctive name for 

 this ancient lake deposit. It is borrowed from a burn of that 

 name which now drains the district in which it is situated, 

 and from a deep narrow cleft through trap rock down which 

 that burn now runs, which is known as Glen Dronachy. 

 It is exceedingly probable that the overflow from the lake 

 began to carve this glen out of the solid rock, as the lake 

 became silted up by the growth of the brown silt accumulat- 

 ing in it gradually forcing the water to make an outlet for 

 itself, which it did in the line of what is now known as Glen 

 Dronachy. 



There are now six places in Scotland where ancient lake 

 deposits with Arctic plants have been found, viz. Hailes and 

 Corstorphine near Edinburgh, Burnhead (R. Dunlop) and 

 Faskine (W. Jack) near Airdrie, Crianlarich on the West 

 Highland Railway (C. Reid), and now Dronachy near 

 Auchtertool ; and in three of these Hailes, Corstorphine, 

 and Dronachy remains of Apits have been found. 



Were even a cursory search made into old lakes where 

 marl has been known to occur, it is more than likely that 

 many more might yet be found. As an incentive to such 

 search, it may be stated that it was almost by a peradventure 

 that Dronachy was discovered to be an Arctic lake deposit. 

 Our first knowledge of it was due to a piece of the marl 

 felted with Potamogeton leaves and crowded with shells 

 being brought from it by Mr. Duncan, attendant in the 

 Museum of Science and Art, Edinburgh. Several visits were 

 made, and portions of the deposit were washed and examined 

 before the Arctic plants and the Apus remains were dis- 

 covered. This arose from the fact that since at Corstorphine 

 the Arctic bed lay between the marl and the boulder clay, 

 it was sought for in the same position at Dronachy, and 

 could not be found there. It was only on the third visit, 

 when the bed of brown earthy silt which lay upon the marl 



