Some tubular glands would be the liver, kidneys, testes, lachrymal glands, serous glands of the mucous membranes, fundus glands of the stomach, uterine glands, the majority of the pyloric glands and the majority of the sweat glands. _Alveolar Glands._—In these, the secreting compartments have the form of variously shaped vesicles or saccules, known as alveoli which open on the free surface or into a duct. Alveolar glands may be either simple, simple branched, or compound branched. Some alveolar glands would be the sebaceous glands, pancreas, mammary gland, ovary and thyroid. _Tubulo-alveolar Glands._—In these, there is a combination of the tubular and the alveolar type. They may also be simple, simple branched or compound branched. Some of this type would be certain of the pyloric glands, certain of the sweat glands, some mucous glands, the prostate and the lungs. The most important glands will be discussed under the tissue or the organ in which they are situated. =Cartilage.=—Cartilage is a transition stage between connective tissue and bone; when it is boiled it yields condrin. It is found in various parts of the body, in the adults being found chiefly in the joints, in the sides of the thorax, and in various tubes which are not kept permanently open, such as the air passages, nostrils, ears, etc. In the foetus, the greater part of the framework is cartilaginous and as the foetus matures this cartilage is finally replaced by bone. Cartilage is divided into hyaline cartilage, elastic cartilage, and fibro cartilage. _Hyaline cartilage_ is found in the nose, larynx, trachea, and bronchi. _Elastic cartilage_ is found in the epiglottis and the cartilages of the larynx. _Fibro cartilage_ is found at the point of insertion of the ligaments, into the body of the bone, such as the cartilage which helps to hold the femur or long bone of the thigh into the hip. =Bones.=—Bone results from the calcification of cartilage or fibrous tissue. It is a highly specialized form of connective tissue. There are two varieties of bone; dense or compact bone and cancellous, loose, or spongy bone. Compact bone is dense, like ivory, and is always found on the exterior of bones. Cancellous bone is found in the interior of bones, and has a lattice-work appearance.