diatomace.il 



DIRECTIONS FOR COLLECTING, PRESERVING AND 

 TRANSPORTING SPECIMENS OF DIATOMACEM 



PIE Diatomacesa constitute a group of 

 organisms of so much interest to the 

 student of natural history, that it is 

 desirable that specimens should he 

 collected in various parts of the 

 world. That such collections may 

 be of value, it is necessary that they 

 should be made in a proper manner; 

 and for the purpose of facilitating 

 the making of such collections, these 

 directions have been drawn up. Tie- 

 directions given should be olos 

 followed, as the methods described 

 have been found, after considerable 

 trial, to be those yielding the most 

 satisfactory result.-. A- the fossil 

 deposits containing the remains <>f diatomacese are most readily 

 recognized, gathered, and i'orwaided, they will be iirst described. 

 Fossil Deposits, Included under this head must be consid- 

 ered the enormous sab-plutonic strata found en the Pacific 

 coast of North America, so that the fossil deposits of diatom 



aoeffi may be said to contain both fresh-water and marine 

 Species, though never in a mixed state. In some oases the 



particular species present indicate the character of the pie< 



water in which the deposit has accumulated, different foil 



groups of forms, appearing in bays, ponds, lakes, marshes, 



Springs and rivers, and at various points of elevation above the 

 surface of the sea. 



