WAS THE CHILD BOKN" ALIVE ? 34T This condition their colour cannot be simulated by artificially is then cinnabar red, without any air into the lungs, inflating the lungs, as mottling. (^^JS&agbt.—As regards the weight of the lungs two tests are applied, viz. the static test obtained by taking the absolute weight of the lungs, and the hydrostatic test which depends on their specific gravity. Static Test or Fodere's Test.—In order to weigh the lungs they are removed along with the windpipe and bronchi after ligaturing the pulmonary vessels and sepa- rating them from the heart and thymus gland, average weight of the lungs varies from 450 to 6TO grains, while, owing to the increased flow of blood into the lungs, their weight is increased after respiration from 900 to 1,000 grains. This varies in proportion to the weight and development of the child and according to the degree of respiration that has taken place. For obvious reasons it is not possible to weigh the lungs before and after respiration in any one case. Hence this test is worthless for medico- 1 legal purposes, and another test has been devised in which the ratio of the weight of the lungs to that of the Ixxiy is taken into consideration to e&tabllsfct Fig. 249.—Respired lungs of an infant who the ,fact of live-birth. TSiis survived after birth. is knowEt, as Plcwcqwefs Test as Ploocquet was tibe first to ascertain that the proportion of the weight of the lungs to feat of Hie body is 1 : 70 before respiration, and 1 : 35 after respiration, but this test also has no medico-legal value as the ratio of the weights is mostly variable. •* «* Hydrostatic Test.—TQbis***is* the most reliable and valuable Jgjsi^ and should, as a rule, be performed before an opinion is given as to^metifaer sespration has taken place or not. J£Ms based on the fact that the specific Cavity of the unrespired lungs var&lrom 1,040 to 1,056, and that of €be jfespired lungs is 940 owing to their volume being increased due to the .presence of air. J3l£ ^^ lungs, therefore, sink in water, and those, that faave breathed, float The Method of Test.—The method of performing the test is* to fee lungs as far as the trachea along with the heart and thymils securing the large vessels, and to place them in a glass jar or vessel* twelve inches high and eight to ten inches in diameter, filled gr preferably with distilled water, and to note whether they<1 ** ^ lungs are then separated from the heart and thymus by the bronchi, and dividing them above it, when each Imi into the vessel to note its buoyancy. Each inE^g r5,*:fe'