Manchester Memoirs, Vol. I Hi. (1909), No. 10. 5 



"Microscopical examination shows that sample con- 

 tains Httle or no sand." 



The deposit, which is of a dull, bluish-gray colour, 

 with a brownish tinge when in situ, is dug out in the 

 shape of bricks with a turf spade, and spread out on the 

 surface of the neighbouring fields to dry, when it becomes 

 quite white. In this state it has a specific gravity of "5422. 

 When thoroughly dry it is milled to a fine powder, 

 and put up in sacks for export. 



At Culbane, and further north, the deposit, though to 

 all appearances of the same composition, is not used in 

 the same manner, but is dug out by the local farmers, 

 mixed with clay, and made into bricks. 



In the course of working the deposit at the various 

 places, and especially near Culbane, large numbers of flint 

 and stone weapons have been found embedded in the 

 deposit itself, and in the overlying peat. A number of 

 these are described in the following pages. 



Through the kindness of Mr. S. Chaffers, of the Victoria 

 University, Manchester, I am able to give the following 

 fairly representative list of the principal diatoms occurring 

 in the deposit at Toome : — 



Surirella biseriata Breb. var. Infrous Kiitz. 

 „ elegans Ehr. 

 „ robust a Ehr. 

 Piniuihxria nobilis Ehr. 

 „ major Kiitz. 



„ heiiiiptera Kiitz. 



„ stieptorapJie var minor Cleve. 



EpitJicmia Hyiidiiuriini Wm. Smith. 



„ turgida Kiitz \2,x. giaiiulata. 



„ Miilleri. 



Navicula (Caloneis) Silicula Ehr. var alpina Cleve. 

 ,, „ latiusciila Kiitz. 



