. Injurious and useful insects; an introduction to the study of economic entomology. Insects; Beneficial insects; Insect pests. DISSECTION OF A COCKROACH 19 muscular wall of the gizzard can be contracted, so as to prevent the passage of the food to the stomach until it has become fluid or semi-fluid. Then the gizzard is relaxed, and the more or less fluid food passed into the stomach to be absorbed. The cockroach is particularly addicted to starchy food, but will devour bits of flesh, and almost everything which is eaten by man. The alimentary canal is partly embedded in a mass of white sub- s

. Injurious and useful insects; an introduction to the study of economic entomology. Insects; Beneficial insects; Insect pests. DISSECTION OF A COCKROACH 19 muscular wall of the gizzard can be contracted, so as to prevent the passage of the food to the stomach until it has become fluid or semi-fluid. Then the gizzard is relaxed, and the more or less fluid food passed into the stomach to be absorbed. The cockroach is particularly addicted to starchy food, but will devour bits of flesh, and almost everything which is eaten by man. The alimentary canal is partly embedded in a mass of white sub- s Stock Photo
Preview

Image details

Contributor:

Central Historic Books / Alamy Stock Photo

Image ID:

PG4AG7

File size:

7.1 MB (397.2 KB Compressed download)

Releases:

Model - no | Property - noDo I need a release?

Dimensions:

923 x 2707 px | 7.8 x 22.9 cm | 3.1 x 9 inches | 300dpi

More information:

This image is a public domain image, which means either that copyright has expired in the image or the copyright holder has waived their copyright. Alamy charges you a fee for access to the high resolution copy of the image.

This image could have imperfections as it’s either historical or reportage.

. Injurious and useful insects; an introduction to the study of economic entomology. Insects; Beneficial insects; Insect pests. DISSECTION OF A COCKROACH 19 muscular wall of the gizzard can be contracted, so as to prevent the passage of the food to the stomach until it has become fluid or semi-fluid. Then the gizzard is relaxed, and the more or less fluid food passed into the stomach to be absorbed. The cockroach is particularly addicted to starchy food, but will devour bits of flesh, and almost everything which is eaten by man. The alimentary canal is partly embedded in a mass of white sub- stance, the fat-body, which is made up of a multitude of small fat- particles, attached together and overspread by fine tracheal tubes. When the alimentary canal is dis- placed, the fat-body is fully ex- posed to view. Pull out some pieces with the forceps, and place them under the microscope to ob- serve the tracheal branches. Add ether to the preparation, arid re- place the loss from evaporation as required ; the fat slowly dissolves. Add osmic acid (one per cent, solution); the fat turns brown, and ultimately black. TJiese tests for small quantities of fatty substance are often resorted to by the micro- scopic observer. Between the wall of the body and the alimentary canal is an irregular space (the body-cavity) partly occupied by the salivary glands, Malpighian tubules, ovaries, etc. It is of no great extent in the cockroach, but be- comes large in proportion to the body in some insect-larv». Through it the blood courses, after escapmg from the open fore end of the heart, and returns agam to the heart by lateral inlets. The circumstance that such organs as the. Fig. 17.—Tracheal system of cockroach. The dorsal _ integu- ment removed and the viscera in place.. 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 wo

Save up to 70% with our image packs

Pre-pay for multiple images and download on demand.

View discounts