The Scoop Dredge. 241 



objectionable, afford ui reality an important advantage 

 to the naturalist, for, by pulling it at once on the spot 

 where it descends, he is able to establish the habitat 

 of the animals there found, thus obviating all doubt 

 on that point that might be caused by the dredge 

 being dragged over many hundred yards," 



The details of the construction of this instrument, 

 known as the scoop dredge, or Robertson's dredge, 

 will be found in the appendix. There also some 

 notices are given of other contrivances invented by 

 Mr. Robertson for facilitating the study of natural 

 history, but of which the description is too technical 

 to be included in the general course of the narrative. 



