These are probably important in checking overgrowth by encrusting organisms, and in particular by preventing larvae from fixing on the zoarium.
Solenia, Cyphella - and even simpler cases are met with in Mortierella, where the zygospore is invested by the overgrowth of a dense mat of closely branching hyphae, and in Gymnoascus, where a loose mat of similarly barren hyphae covers in the tufts of asci as they develop.
The primordium of the neurochord (neural or medullary plate) referred to above becomes closed in from the surface by the overgrowth of surrounding epiblast, and its edges also bend up, meet, and finally fuse to form a tube, the medullary or neural tube.
An important fact to note is that the blastopore is included in this overgrowth of epiblast, so that the neural tube remains for some time in open communication with the archenteron by means of a posterior neurenteric canal.
Roots are often flattened, twisted and otherwise distorted by mechanical obstacles; stems by excess of food in rich soils, the attacks of minute parasites, overgrowth by climbing plants, &c. Leaves are especially apt to vary, and although the formation of crests, pitchers, puckers, &c., must be put down to the results of abnormal development, it is often difficult to draw the line between teratological and merely varietal phenomena.
Into the legendary overgrowth of the First Crusade we cannot here enter any further 2; but it is perhaps worth while to mention that the French legend of the Third Crusade equally perverted the truth, making Richard I.
Lobular cirrhosis, of ` Gin-drink, I's Li, showing well-formed fibrous overgrowth which has divided up the liver tissue into irregular masses and caused atrophic and d egenerative changes in the liver cells.
- Chronic interstitial myocarditis, showing the muscle fibres in the heart wall being separated and becoming atrophied by a slow fibrous overgrowth of the connective tissue.
In spite of the frequent overgrowth of a luxuriant imagination, the leading ideas of really primitive cosmogonies are extremely simple.
The continued use of large doses of alcohol produces chronic gastritis, in which the continued irritation has led to overgrowth of connective tissue, atrophy of the gastric glands and permanent cessation of the gastric functions.
Apart, however, from self-defence, the main causes of war are four: (I) The desire for territorial expansion, due to the overgrowth of population, and insufficiency of the available food-supply; if the necessary territory cannot be obtained by negotiation, conquest becomes the only alternative to emigration to foreign lands.