ANALYSIS OF THE LESSONS. 



Insects. 614. The Coleopterous order. 615. Comparative length of the ali- 

 mentary canal. 616. Nutrimental organs of Cicindela campestris. 617. The 

 mouth in the Hemipterous order described. 618. Nutrimental organs of 

 Cimex lectularius. 619. The Cockroaches: nutrimental organs of Blatta Ameri- 

 cana described. 620. Description of Pancreatic follicles, peculiar to these in- 

 sects. 621. Their salivary glands illustrated. 



LESSON XXXIX. NUTRITION IN INSECTS, CONTINUED, p. 138. 



622. The Linnsean order of Hemiptera discussed. 623. The Orthopterous 

 order. 624. Nutrimental organs in the Cricket. 626. Salivary glands in Locusta 

 viridissima. 626. The Proventriculus (gizzard) of Gryllotalpa (Mole Cricket). 

 627. Intestinal glands. 628. Ileum of Acheta domestica. 629. Parallelism be- 

 tween vegetable feeding insects and the ruminant quadrupeds. 630. Organs 

 necessary to digest this kind of food. 631. Mouth in the Lepidoptera. 632. 

 Mode of using it. 633. Structure of the under jaws. 634. Structure of the 

 JSsophagus. 635. Alimentary canal of the Cabbage Butterfly. 636. Descrip- 

 tion of it. 



LESSON XL. NUTRITION IN INSECTS, CONTINUED, p. 141. 



637. Nutrimental organs in the Larva : peculiarity in the development of the 

 salivary glands. Structure of the alimentary canal. 638. True salivary glands 

 described. 639. Silk vessels. 640. The change from a Caterpillar to a Chrysalis. 

 641. The formation of silk for the Cocoon. 642. The alimentary canal de- 

 scribed : its several parts. 643. Description of the minute structure of the liver. 



LESSON XTJ. NUTRITION IN INSECTS, CONTINUED, p. 144 



644. Neuropterous insects described. 645. The Dragon flies: their great 

 importance. 646. The Agrions. 647. As larvae, pupae, imago, their habits 

 remain unchanged. 648. Mouth of a Dragon fly. 649. Use of the palpi. 650. 

 Use of the peculiar under lip. 651. THE HYMENOPTERA. The Bees: their 

 mouth. 652. Their nutrimental organs. 653. The pumping stomach. 654. 

 Action of the true stomach. 655. Function of the crop. 656. Structure of 

 the stomach and the bile ducts. 



LESSON XLII. NUTRITION IN INSECTS, CONCLUDED, p. 147. 



657. Form of the mouth in the DIPTERA. 658. Its peculiar form in the pre- 

 daceous diptera. 659. Also in the phytivorous species (vegetable feeders). 

 660. Mouth of ffelophilus tenax. 661. Use of the rugous, fleshy lips. 662. 

 Great development of the pumping stomach. 663. The salivary glands. 664. 

 Position and connections of the oesophagus. 665. Action of the pumping 

 stomach explained. 666. The alimentary canal described. 667. The Apterous 

 insects. 668. Comparison of the nutrimental organs in Insects, and in other 

 animals. 669. Analogy in the digestive sacs of L. viridissima and the Rumi- 

 nants. 670. Resume. 



LESSON XLIH. ORGANS OP NUTRITION IN ARACHNIDA, p. 151. 



671. Characteristics of the class. 672. Minute and parasitic Arachnidans. 



