Please answer the following question: What type of details about william george maccallum  can be gathered from the following bio?  Bio: william george maccallum -lrb- 18 april 1874 -- 3 february 1944 -rrb- was a canadian-american physician and pathologist . he was of scottish descent and was born in dunnville village in canada , where his father was a physician . he was educated at the university of toronto . he graduated with ba in 1894 . initially inclined towards greeks as academic career , his father influenced him to enter medicine . he joined the second year of the first batch of medicine course in the johns hopkins medical school , and became one of the first graduates of the institute in 1897 . he was appointed assistant resident of pathology of the medical school in 1897 , resident pathologist in 1901 , soon after associate professor , and full professor in 1908 . between 1909 and 1917 he held a twin position of professor of pathology at columbia university and the newyork -- presbyterian hospital . from 1917 to 1943 he held the chair of pathogy at johns hopkins university . maccallum discovered the existence of two forms -lrb- now known to be male gamete or microgametocyte and female gamete or macrogametocyte -rrb- of malarial parasite in birds in 1897 . in 1899 he and t.w. hastings discovered a new species of pathogenic gram-positive bacteria called `` micrococcus zymogenes '' . he was the first to describe the structural and functional relationship between lymphatic system and connective tissue . in 1905 he discovered that thyroid and parathyroid glands had completely different functions . he found that muscle seizure -lrb- tetany -rrb- was due to abrogation of parathyroid glands , and that injection of calcium salt could restore the condition . this directly laid the understanding of the role of calcium in muscle contraction . in 1909 he discovered that a disease gastric tetany was not due to parathyroid functions , but because of blockage of the stomach-intestine connection called pylorus . he wrote a definitve textbook `` a textbook of pathology '' which ran several editions and is still in print . a histochemical staining...
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