. The microscope and its revelations. aking care to leaveas many as possible of the branches, which will be seen pro-ceeding to this from the two great longitudinal trachea?, to whoseposition these branches will serve as a guide. Mr. Quekett recom-mended the following as the most simple method of obtaining ;iperfect system of tracheal tubes from a larva. A small opening-having been made in. its body, this is to be placed in strong acetic-acid, which will soften or decompose all the viscera ; and the trachea?may then be well washed with the syringe, and removed from thebody with the greatest fa
. The microscope and its revelations. aking care to leaveas many as possible of the branches, which will be seen pro-ceeding to this from the two great longitudinal trachea?, to whoseposition these branches will serve as a guide. Mr. Quekett recom-mended the following as the most simple method of obtaining ;iperfect system of tracheal tubes from a larva. A small opening-having been made in. its body, this is to be placed in strong acetic-acid, which will soften or decompose all the viscera ; and the trachea?may then be well washed with the syringe, and removed from thebody with the greatest facility, by cutting away the connections ofthe main tubes with the spiracles by means of fine-pointed order to mount them they should be floated upon the slide, onwhich they should then be laid out in the position best adapted fordisplaying them. If they are to be mounted in Canada balsam theyshould be allowed to dry upon the slide, and should then be treatedin the usual way ; but their natural appearance is best preserved. 998 INSECTS AND ARACHMDA liy mounting them in fluid (weak spirit or Goadbys solution), usinga shallow cell to prevent pressure. The finer ramifications of thetrachea! system may generally be seen particularly well in the mem-branous wall of the stomach or intestine ; and this, having been laid outand dried upon the glass, may be mounted in balsam so as to keep thetrachea? full of air (whereby they are much better displayed), if carebe taken to use balsam that has been previously thickened, to dropthis on the object without liquefying it more than is absolutelynecessary, and to heat the slide and the cover (the heat may beadvantageously applied directly to the cover after it has been put-on by turning over the slide so that its upper face shall look down-ward) only to such a degree as to allow the balsam to spread andthe cover to be pressed down. The spiracles are easily dissected outby means of a pointed knife or a pair of fine scissors ; they sho
Size: 1767px × 1414px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
