836 SUMMARY OF CURRENT RESEARCHES RELATING TO 



tightly. On the mouth of the tube is placed a small piece of fine net, 

 and with the ring pressed into the tube equally all round, and all 

 projecting parts of the net above the ring cut off. 



Having inserted the net, the apparatus, with both ends open, is 

 waved through the water, which entering by the larger end escapes by 

 the smaller, leaving the Crustacea on the surface of the net. The cork 

 of the bottle is then inserted in the smaller end, and some water taken 

 up from the pond, which will then by its reverse action wash oflf the 

 animals into the bottle. The use of the cork of the bottle obviates 

 the necessity of a spare cork, which is ajit to get lost. Care should be 

 taken not to fish too quickly, or comj^aratively little may be got, as 

 the large quantity of water cannot get through the net ; and also to 

 fill the apparatus with water slowly and not up to the brim, or what 

 has been caught is washed out. 



Hanaman's Collecting-bottle.*— This consists, as shown in Fig. 

 194, of an ordinary wide-mouth bottle or fruit-jar, having a number 

 of holes half an inch or more in diameter bored 

 liG. 194. through the side at a distance from the bottom 



corresponding to the capacity of the bottles in which 

 the collector intends to bring home his material. 

 Over the holes and around the bottle is tightly tied, 

 or laced, a piece of fine muslin, which should be at 

 least three times as wide as the holes in the bottle. 

 Over the muslin, both above and below the holes, 

 a rubber is placed so as to make all water-tight, 

 except at the points corresponding to the holes. 



Any quantity of water may be poured into the 

 bottle, and it will rapidly run out through the 

 muslin covering the holes, leaving the organisms 

 which it contained in the bottle, together with 

 only so much water as the lower part of the bottle, 

 below the holes, will hold. This can then be poured 

 into smaller bottles for transportation, by so in- 

 clining the collecting-bottle as to allow its contents to run out on the 

 unperforated side. More straining surface can thus be gained, and 

 the nuisance of funnels (necessary in the Wright's form) be dispensed 

 with. 



The principle upon which this bottle is constructed is subject to 

 a variety of modifications. For instance, a slit of any width, from ^ 

 to 1 inch, may be filed in the side of a fruit-jar, and thus addi- 

 tional straining surface be gained ; or a tin or zinc can may be used, 

 having a broad slit in its side over which the muslin can be stretched. 

 If it be preferred to have the strainer inside the vessel, this can be 

 easily arranged by using a vessel with a slit, and placing a diaphragm 

 of thin iron (ferrotype plate) inside, somewhat wider and longer than 

 the slit in the vessel, and having in its centre a slit of the same size 

 as that in the vessel used. A piece of muslin can be drawn over the 



* Amer. Mon. Micr. Journ., ii. (1881) pp. 121-2 (2 figs.).' 



