. Glasgow mechanics' magazine; and annals of philosophy . t I never observed that anyof them attained, by habit, the power ofremaining under water longer than thirtyseconds; and even then, on rising to thesurface, they appeared confused. Negroes,and other men who have bean employed inseeking among sunken rocks the hiddentreasures of the deep, are said to have ac-quired a habit of remaining some minutesunder water, but the time was probablymeasured by a rude guess, and not by astop watch. tf^^^^^^^^^^N^^^^i^^^p^^^iMWN^iw^^N^^^^^^^ji Published every Saturday, by W. R. MPhun, 155, Trongate, Glasg
. Glasgow mechanics' magazine; and annals of philosophy . t I never observed that anyof them attained, by habit, the power ofremaining under water longer than thirtyseconds; and even then, on rising to thesurface, they appeared confused. Negroes,and other men who have bean employed inseeking among sunken rocks the hiddentreasures of the deep, are said to have ac-quired a habit of remaining some minutesunder water, but the time was probablymeasured by a rude guess, and not by astop watch. tf^^^^^^^^^^N^^^^i^^^p^^^iMWN^iw^^N^^^^^^^ji Published every Saturday, by W. R. MPhun, 155, Trongate, Glasgow, to whomi Communications (post paid) must be addressed. CURLL, PRINTER. ,2vr ri ^) THE GIiASGOW MJECHANICS MAGAZINE, CONDUCTED BY A Committee of Civil Engineers and Practical Mechanics, A weaker man may sometimes light on notions which have escaped a wiser; and which thewiser man might make a happy use of, if he would condescend to take notice of them. No. CXII. Saturday, Wth February, 1826. Price 3cf. APPARENT DIRECTION OF THE EYES IN A Tij. 1. Fi^. 2 Fig. 3. + Vol. IV.
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