. Culture methods for invertebrate animals;. Invertebrates -- Cultures and culture media; Invertebrates -- Collection and preservation. 12 Marine Invertebrates should be used. It is advisable to have the silk part of the net sewn on a canvas collar folded over the metal ring and fastened to it by means of buttons. The lower end of the net is also made of a canvas collar which is slipped over the metal bucket and fastened to it by a clamp ring. The bucket has windows covered with bolting silk and is provided with a stop cock for draining. A small glass bottle or jar may be used instead of a buc
. Culture methods for invertebrate animals;. Invertebrates -- Cultures and culture media; Invertebrates -- Collection and preservation. 12 Marine Invertebrates should be used. It is advisable to have the silk part of the net sewn on a canvas collar folded over the metal ring and fastened to it by means of buttons. The lower end of the net is also made of a canvas collar which is slipped over the metal bucket and fastened to it by a clamp ring. The bucket has windows covered with bolting silk and is provided with a stop cock for draining. A small glass bottle or jar may be used instead of a bucket. Nets one foot in diameter are the most convenient ones to handle from a small boat. The plankton trawl. Planktonic forms living just above the bottom may be collected by means of a plankton net mounted in a horizontal position on a frame attached at right angles to a sheet of galvanized iron. When the plankton trawl (Fig. 16) is dragged it slides over the bottom and catches the organisms which otherwise escape capture. The metal sheet protects the net which does not come in contact with the bot- tom and therefore may be made of fine bolting silk. The glass bottomed box. In shallow waters the ob- servation and collection of bottom animals are greatly facilitated by using a water tight box with a pane of plate glass fitted in the bottom. The dimensions and shape may vary to suit individual purposes. The box used by the author is 11 inches high with square bottom and top, 9x9 and n x 11 inches respectively (Fig. 17). It is fastened to a boat by a short line and is placed in the water with the glass side down. It smooths the ruffled surface of the water. Goggles. Goggles (Fig. 18) are widely used in the Orient by pearl-. Fig. 15. — The plankton Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Galtsof
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Keywords: ., bo, bookcentury1900, bookcollectionbiodiversity, bookleafnumber48
