The following have been held proper subjects for the introduction of expert testimony: The care and handling of domestic animals; meaning of entries in books; agriculture and crops; diseases of men or of animals; blood and blood-stains; the nature and effects of poisons; architecture and building; chemistry; all branches of medicine and surgery; anatomy; electricity; explosives and fire-arms; jewelry; engineering and machinery; cause of death; abortion; drowning; suffocation; strangulation; time of death; post-mortem examinations; genuine and feigned diseases; pregnancy; rape; nature, cause and effect of wounds, and the means by which probably inflicted; distance at which shot was fired; whether wounds were suicidal or homicidal; seaworthiness of vessels and seamanship; medical remedies and appliances; surveying; photography; weather; law of a foreign state; gas and steam fitting; geology; elevator devices; midwifery; botany; banking; insanity; malpractice, injuries and wounds, etc.