BULLETIN 39, UNITED STATES NATIONAL MUSEUM. [30] 



out and put into the collecting-vials. From this mode of operation it 

 is evident that the sweeping net must be stronger in all its parts than 

 the butterfly net, but otherwise it may be made on the same plan. 



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FIG. 47. The Deyrolle Sweeping Net. a, net entire; b, frame; c and d, attachment of frame and 



handle (original). 



The ling should be rigid, made of brass or iron, either of one piece 

 or of two pieces, and fastened to the handle or stick in the same way 

 as the butterfly net. The bag need not be as long as in the butterfly net, 

 about 18 inches being sufficient, but it should be of stout cottou or linen 

 and the bottom should preferably be sewed in as a round piece, so as to 

 avoid corners. Care needs to be bestowed on the fastening of the bag 

 on the ring, for by the use of the net the part of the bag sewed around 

 the ring is soon chafed through. To prevent this a strip of leather is 

 sewed over the cotton along the rim, but since even this must be fre- 

 quently renewed some other devices are used to give greater durability 

 to the net. In the pattern of a beating-net originally sold by Deyrolle 

 in Paris, the metal ring was flattened, with the narrow edge pointing 

 upwards and the broad side pierced with holes at suitable intervals and 

 grooved on the outer surface between the holes. The bag is sewed on 

 to the inner side of the ring by stout twine, which passes from one 

 hole to the next and is thus prevented from coming in contact with ob- 

 structive objects, and only the bottom of the bag wears and will need to 

 !>' occasionally mended or renewed. 



Another method of preventing the tearing of the upper riui of the 

 !>:ig is described and illustrated in Kieseuwetter's useful volume ' I)T 

 Naturaliensammler" from which I shall frequently have omission to 

 quote. In this net the main ring is of rounded iron wire on which a 

 number of brass rings are slipped. These must be but little larger 



