Journal of Applied Microscopy. 



113 



cones may then be completed by closing 

 the sides with a French seam. If no 

 bucket is desired at the end of the net, 

 it may be closed by the seam "ef." The 

 condensation and transfer of the catch 

 to a bottle for preservation, is, however, 

 more effectively and quickly accom- 

 plished if a bucket is used. The place at 

 which the attachment of the bucket 

 should be made can be indicated by 

 striking the arc "gh," equal in length 

 to one-half of the circumference of the 

 bucket. The tip of the net may then be 

 cut off at "ij" and the silk slit along the 

 dotted lines to allow for the fitting and 

 fastening of the bucket in place. 



Fig. 5. 



The top of the net is finished by sew- 

 ing on the headpiece (h. p. Fig. 2,) which 

 is made of a doubled strip of butcher's 

 linen, cut bias, and having a heavy cord 

 sewed in the upper margin. The net is 

 fastened to the ring which supports the 

 mouth, by a series of overcast stitches 

 of heavy thread. This ring (r) should 

 be made of No. 5 spring brass wire 

 (American Standard Gauge). At equi- 

 distant points upon it are soldered three 

 pairs of hips (h) or wire rings, which 

 serve to hold the draw-lines (d. 1.) in 

 place. At the junction of the draw- 

 lines, a short cord serves as a weight- 

 line (w 1.), to which a weight can be 

 attached when towing in deep water. 



An inexpensive, and at the same time 

 convenient, bucket can be made of sheet 

 copper in the form of a cylinder three 

 inches in height and two inches in dia- 

 meter. Two light wire rings (r and n. 

 Fig. 3) are soldered around the upper 

 end of and hold in place between them 

 the string "s" which ties the tip of the 

 net to the bucket. 



In the sides of the cylinder are cut 

 three equidistant windows, each one and 

 one-half by one and three-fourth inches, 

 which are closed by brass wire gauze 

 (w. g.) soldered to the edges. Gauze 

 containing 200 meshes per linear inch 

 answers very well for these windows. 



The bottom (b) of the bucket is formed 

 by an obtuse truncated cone of copper 

 which meets the sides of the cylinder 

 an inch above its base. At its center 

 is an opening one-half inch in diameter, 

 which is continued in a short tube (t) 

 which reaches almost to the bottom of 



the bucket and is obliquely pointed, 

 forming a drip point (d. p.). The opening 

 is closed by a rubber cork whose wire 

 handle projects slightly above the top 

 of the bucket. 



A detachable bucket was described by 

 the writer,* which is adopted for use 

 on the plankton net in vertical or ob- 

 lique hauls. If made of lighter construc- 

 tion, it might well be used upon a tow 

 net. This bucket consists of two parts, 

 a head-piece (h. p. Fig. 4) and the bucket 

 proper. The head-piece bears a net 

 clamp (n. c.) which binds the end of the 

 net (s) to the top of the bucket. The 

 clamp is tightened by means of the 

 thumb screw (t. s.) in the wing (w. n. 

 c). The lower edge of the head-piece 

 bears threads at "m," which' fit corres- 

 ponding threads on the bucket at "n." 

 The windows (w) shown in cross-section 

 in Fig. 5, are closed with silk (s), held 

 in place by a band-claim (b. c.) which 

 is tightened by screws (s. c.) in the 

 plates (pi. and pi.). The bottom (b) of 

 the bucket is provided with an outlet 

 and drip-point (d. p.). A handled plug 

 (p) closes the opening. The band of silk 

 is fastened onto the body of the bucket 

 and the pillar (pi) between the windows, 

 with King's waterproof cement, and the 

 clamp is then bound against it. This 

 method of closing the windows in the 

 bucket permits the ready renewal of 

 the silk when it becomes worn or clog- 

 ged. Owing to the weight of this form 

 of bucket, it is advisable to support by 

 three equidistant stay-lines (s. 1.), 

 which are fastened in eyes (e) in the 

 head-pieces and thence pass to the hips 

 on the ring at the mouth of the net. 



The advantages of the detachable 

 bucket are the freedom from the net, 

 and ease in the subsequent handling of 

 the catch. 



Charles A. Kofoid. 



Illinois Biological Station. 



*Bull. 111. State Lab. Nat. Hist. Vol V. 

 Art. I, pp. 5-8. 



A Simple Urine Sedimentation Ap- 

 paratus. 



The following is a description of an 

 apparatus which is used and described 

 by Charles S. Swan, M. D., of Bos- 

 ton, Mass., for collecting urine sedi- 

 ments. It consists primarily of a 

 piece of glass tubing (T) three-fourths 

 inch inside diameter and three inches in 

 length, which is held firmly between two 

 wooden slips (S) by two rods (R) upon 

 the ends of which threads are cut for 

 the milled head nuts (N,) as shown in 

 the accompanying figure. The rods are 



