. On microscopical manipulation : being the subject matter of a course of lectures delivered before the Quekett Microscopical Club, January-April, 1869. the needle is soft, it may, bythe exercise of a little dexterity, be hammered out soas to form a small knife, or lancet, which can thenbe hardened so as to take a cutting edge; many use-ful instruments can also be made out of small piecesof steel. Needles and cutting instruments are bestsharpened upon a very hard, white stone, known atthe tool shops as Arkansas oil-stone ; it cuts veryrapidly, and gives an extremely fine edge. Scissors,when bl
. On microscopical manipulation : being the subject matter of a course of lectures delivered before the Quekett Microscopical Club, January-April, 1869. the needle is soft, it may, bythe exercise of a little dexterity, be hammered out soas to form a small knife, or lancet, which can thenbe hardened so as to take a cutting edge; many use-ful instruments can also be made out of small piecesof steel. Needles and cutting instruments are bestsharpened upon a very hard, white stone, known atthe tool shops as Arkansas oil-stone ; it cuts veryrapidly, and gives an extremely fine edge. Scissors,when blunt, may readily be sharpened on the oil-stone, by opening the blades and rubbing them onthe stone, holding them nearly upright. The burrproduced by this operation need not be ground off,as it is soon removed when the blades are workedtogether ; the screw is to be tightened if delicate disse(5tions, the steadiest cutting instru-ment is a kind of scissors, made almost exadtly likea minute pair of sheep shears, affd known as the micro-tome; in use, it feels very much as if the fingers wereextended-and:3rn^ed^ith cutting edges. There is. DISSECTING INSTRUMENTS. 51 hardly any other cutting instrument so much underthe control of the operator. The best handles for needles and other smallinstruments are made of cedar pen-holders, intowhich the needle, with the eye broken of, is insertedwith a pair of pliers. Very convenient handles,which have the advantage of allowing the needlesto be removed at pleasure, are to be purchased atfancy v/arehouses ; they are used for holding crochethooks ; they are improved by the removal of theivory handle, and the substitution of one made of acedar pen-holder, which can easily be attached to themetal socket with ele(5trical cement^ and will be foundto be lighter and more pleasant in use. E 2 52 CHAPTER III. THE processes connecfted with the preparationand preservation of microscopical objects havealways occupied a considerable space in nea
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